Set plugin version to chylex-41

This reverts commit 1fa78935

.teamcity/_Self/Project.kt

@@ -27,6 +27,7 @@ object Project : Project({
   // Active tests
   buildType(TestingBuildType("Latest EAP", "<default>", version = "LATEST-EAP-SNAPSHOT"))
   buildType(TestingBuildType("2024.1.1", "<default>"))
+  buildType(TestingBuildType("2024.2", "<default>"))
   buildType(TestingBuildType("Latest EAP With Xorg", "<default>", version = "LATEST-EAP-SNAPSHOT"))
 
   buildType(PropertyBased)

AUTHORS.md

@@ -535,6 +535,10 @@ Contributors:
   [![icon][github]](https://github.com/igorbabko)
    
   Igor Babko
+* [![icon][mail]](mailto:533601+felixwiemuth@users.noreply.github.com)
+  [![icon][github]](https://github.com/felixwiemuth)
+   
+  Felix Wiemuth
 
 Previous contributors:
 

doc/set-commands.md

@@ -8,7 +8,7 @@ Every effort is made to make these options compatible with Vim behaviour.
 However, some differences are inevitable.
 
 ```
-'clipboard'     'cb'    Defines clipboard behavioue
+'clipboard'     'cb'    Defines clipboard behavior
         A comma-separated list of words to control clipboard behaviour:
            unnamed      The clipboard register '*' is used instead of the
                         unnamed register

gradle.properties

@@ -20,7 +20,7 @@ ideaVersion=2024.2
 # Values for type: https://plugins.jetbrains.com/docs/intellij/tools-gradle-intellij-plugin.html#intellij-extension-type
 ideaType=IC
 instrumentPluginCode=true
-version=chylex-40
+version=chylex-41
 javaVersion=17
 remoteRobotVersion=0.11.23
 antlrVersion=4.10.1

src/main/java/com/maddyhome/idea/vim/PluginStartup.kt

@@ -8,6 +8,10 @@
 
 package com.maddyhome.idea.vim
 
+import com.intellij.ide.BrowserUtil
+import com.intellij.ide.plugins.IdeaPluginDescriptor
+import com.intellij.ide.plugins.PluginStateListener
+import com.intellij.ide.plugins.PluginStateManager
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.fileEditor.ex.FileEditorManagerEx
 import com.intellij.openapi.project.Project
@@ -40,6 +44,18 @@ internal class PluginStartup : ProjectActivity/*, LightEditCompatible*/ {
 
     // This code should be executed once
     VimPlugin.getInstance().initialize()
+
+    // Uninstall survey. Should be registered once for all projects
+    PluginStateManager.addStateListener(object : PluginStateListener {
+      override fun install(p0: IdeaPluginDescriptor) {/*Nothing*/
+      }
+
+      override fun uninstall(descriptor: IdeaPluginDescriptor) {
+        if (descriptor.pluginId == VimPlugin.getPluginId()) {
+          BrowserUtil.open("https://surveys.jetbrains.com/s3/ideavim-uninstall-feedback")
+        }
+      }
+    })
   }
 }
 

src/main/java/com/maddyhome/idea/vim/action/change/OperatorAction.kt

@@ -37,7 +37,7 @@ import com.maddyhome.idea.vim.vimscript.model.expressions.FunctionCallExpression
 import com.maddyhome.idea.vim.vimscript.model.expressions.SimpleExpression
 
 // todo make it multicaret
-private fun doOperatorAction(editor: VimEditor, context: ExecutionContext, textRange: TextRange, selectionType: SelectionType): Boolean {
+private fun doOperatorAction(editor: VimEditor, context: ExecutionContext, textRange: TextRange, motionType: SelectionType): Boolean {
   val func = injector.globalOptions().operatorfunc
   if (func.isEmpty()) {
     VimPlugin.showMessage(MessageHelper.message("E774"))
@@ -57,9 +57,9 @@ private fun doOperatorAction(editor: VimEditor, context: ExecutionContext, textR
         if (value is VimFuncref) {
           handler = value.handler
         }
-      } catch (ex: ExException) {
+      } catch (_: ExException) {
         // Get the argument for function('...') or funcref('...') for the error message
-        val functionName = if (expression is FunctionCallExpression && expression.arguments.size > 0) {
+        val functionName = if (expression is FunctionCallExpression && expression.arguments.isNotEmpty()) {
           expression.arguments[0].evaluate(editor, context, scriptContext).toString()
         }
         else {
@@ -77,7 +77,7 @@ private fun doOperatorAction(editor: VimEditor, context: ExecutionContext, textR
     return false
   }
 
-  val arg = when (selectionType) {
+  val arg = when (motionType) {
     SelectionType.LINE_WISE -> "line"
     SelectionType.CHARACTER_WISE -> "char"
     SelectionType.BLOCK_WISE -> "block"
@@ -101,19 +101,13 @@ internal class OperatorAction : VimActionHandler.SingleExecution() {
   override val argumentType: Argument.Type = Argument.Type.MOTION
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
-    val argument = cmd.argument ?: return false
+    val argument = cmd.argument as? Argument.Motion ?: return false
     if (!editor.inRepeatMode) {
       argumentCaptured = argument
     }
     val range = getMotionRange(editor, context, argument, operatorArguments)
-
     if (range != null) {
-      val selectionType = if (argument.motion.isLinewiseMotion()) {
-        SelectionType.LINE_WISE
-      } else {
-        SelectionType.CHARACTER_WISE
-      }
-      return doOperatorAction(editor, context, range, selectionType)
+      return doOperatorAction(editor, context, range, argument.getMotionType())
     }
     return false
   }
@@ -121,7 +115,7 @@ internal class OperatorAction : VimActionHandler.SingleExecution() {
   private fun getMotionRange(
     editor: VimEditor,
     context: ExecutionContext,
-    argument: Argument,
+    argument: Argument.Motion,
     operatorArguments: OperatorArguments,
   ): TextRange? {
     // Note that we're using getMotionRange2 in order to avoid normalising the linewise range into line start
@@ -136,7 +130,7 @@ internal class OperatorAction : VimActionHandler.SingleExecution() {
       operatorArguments,
     )?.normalize()?.let {
       // If we're linewise, make sure the end offset isn't just the EOL char
-      if (argument.motion.isLinewiseMotion() && it.endOffset < editor.fileSize()) {
+      if (argument.getMotionType() == SelectionType.LINE_WISE && it.endOffset < editor.fileSize()) {
         TextRange(it.startOffset, it.endOffset + 1)
       } else {
         it

src/main/java/com/maddyhome/idea/vim/action/change/RepeatChangeAction.kt

@@ -25,7 +25,7 @@ internal class RepeatChangeAction : VimActionHandler.SingleExecution() {
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     val state = injector.vimState
-    val lastCommand = VimRepeater.lastChangeCommand
+    var lastCommand = VimRepeater.lastChangeCommand
 
     if (lastCommand == null && Extension.lastExtensionHandler == null) return false
 
@@ -57,12 +57,7 @@ internal class RepeatChangeAction : VimActionHandler.SingleExecution() {
       )
     } else if (!repeatHandler && lastCommand != null) {
       if (cmd.rawCount > 0) {
-        lastCommand.rawCount = cmd.count
-        val arg = lastCommand.argument
-        if (arg != null) {
-          val mot = arg.motion
-          mot.rawCount = 0
-        }
+        lastCommand = lastCommand.copy(rawCount = cmd.rawCount)
       }
       state.executingCommand = lastCommand
 

src/main/java/com/maddyhome/idea/vim/action/change/delete/DeleteJoinLinesAction.kt

@@ -40,7 +40,7 @@ class DeleteJoinLinesAction : ChangeEditorActionHandler.ConditionalSingleExecuti
   ): Boolean {
     injector.editorGroup.notifyIdeaJoin(editor)
 
-    return injector.changeGroup.deleteJoinLines(editor, caret, operatorArguments.count1, false, operatorArguments)
+    return injector.changeGroup.deleteJoinLines(editor, caret, operatorArguments.count1, false)
   }
 
   override fun execute(

src/main/java/com/maddyhome/idea/vim/action/change/delete/DeleteJoinLinesSpacesAction.kt

@@ -35,7 +35,7 @@ class DeleteJoinLinesSpacesAction : ChangeEditorActionHandler.SingleExecution()
     injector.editorGroup.notifyIdeaJoin(editor)
     var res = true
     editor.nativeCarets().sortedByDescending { it.offset }.forEach { caret ->
-      if (!injector.changeGroup.deleteJoinLines(editor, caret, operatorArguments.count1, true, operatorArguments)) {
+      if (!injector.changeGroup.deleteJoinLines(editor, caret, operatorArguments.count1, true)) {
         res = false
       }
     }

src/main/java/com/maddyhome/idea/vim/action/editor/VimEditorActions.kt

@@ -22,11 +22,6 @@ import com.maddyhome.idea.vim.handler.VimActionHandler
 import com.maddyhome.idea.vim.helper.enumSetOf
 import java.util.*
 
-@CommandOrMotion(keys = ["<C-H>", "<BS>"], modes = [Mode.INSERT])
-internal class VimEditorBackSpace : IdeActionHandler(IdeActions.ACTION_EDITOR_BACKSPACE) {
-  override val type: Command.Type = Command.Type.DELETE
-}
-
 @CommandOrMotion(keys = ["<Del>"], modes = [Mode.INSERT])
 internal class VimEditorDelete : IdeActionHandler(IdeActions.ACTION_EDITOR_DELETE) {
   override val type: Command.Type = Command.Type.DELETE

src/main/java/com/maddyhome/idea/vim/extension/argtextobj/VimArgTextObjExtension.java

@@ -33,7 +33,6 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayDeque;
 import java.util.Deque;
-import java.util.EnumSet;
 
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putExtensionHandlerMapping;
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putKeyMappingIfMissing;
@@ -64,8 +63,8 @@ public class VimArgTextObjExtension implements VimExtension {
    */
   private static class BracketPairs {
     // NOTE: brackets must match by the position, and ordered by rank (highest to lowest).
-    @NotNull private final String openBrackets;
-    @NotNull private final String closeBrackets;
+    private final @NotNull String openBrackets;
+    private final @NotNull String closeBrackets;
 
     static class ParseException extends Exception {
       public ParseException(@NotNull String message) {
@@ -87,8 +86,7 @@ public class VimArgTextObjExtension implements VimExtension {
      * @param bracketPairs comma-separated list of colon-separated bracket pairs.
      * @throws ParseException if a syntax error is detected.
      */
-    @NotNull
-    static BracketPairs fromBracketPairList(@NotNull final String bracketPairs) throws ParseException {
+    static @NotNull BracketPairs fromBracketPairList(final @NotNull String bracketPairs) throws ParseException {
       StringBuilder openBrackets = new StringBuilder();
       StringBuilder closeBrackets = new StringBuilder();
       ParseState state = ParseState.OPEN;
@@ -128,7 +126,7 @@ public class VimArgTextObjExtension implements VimExtension {
       return new BracketPairs(openBrackets.toString(), closeBrackets.toString());
     }
 
-    BracketPairs(@NotNull final String openBrackets, @NotNull final String closeBrackets) {
+    BracketPairs(final @NotNull String openBrackets, final @NotNull String closeBrackets) {
       assert openBrackets.length() == closeBrackets.length();
       this.openBrackets = openBrackets;
       this.closeBrackets = closeBrackets;
@@ -158,10 +156,9 @@ public class VimArgTextObjExtension implements VimExtension {
     }
   }
 
-  public static final BracketPairs DEFAULT_BRACKET_PAIRS = new BracketPairs("(", ")");
+  private static final BracketPairs DEFAULT_BRACKET_PAIRS = new BracketPairs("(", ")");
 
-  @Nullable
-  private static String bracketPairsVariable() {
+  private static @Nullable String bracketPairsVariable() {
     final Object value = VimPlugin.getVariableService().getGlobalVariableValue("argtextobj_pairs");
     if (value instanceof VimString vimValue) {
       return vimValue.getValue();
@@ -192,9 +189,8 @@ public class VimArgTextObjExtension implements VimExtension {
         this.isInner = isInner;
       }
 
-      @Nullable
       @Override
-      public TextRange getRange(@NotNull VimEditor editor,
+      public @Nullable TextRange getRange(@NotNull VimEditor editor,
                                           @NotNull ImmutableVimCaret caret,
                                           @NotNull ExecutionContext context,
                                           int count,
@@ -236,24 +232,22 @@ public class VimArgTextObjExtension implements VimExtension {
         return new TextRange(finder.getLeftBound(), finder.getRightBound());
       }
 
-      @NotNull
       @Override
-      public TextObjectVisualType getVisualType() {
+      public @NotNull TextObjectVisualType getVisualType() {
         return TextObjectVisualType.CHARACTER_WISE;
       }
     }
 
     @Override
     public void execute(@NotNull VimEditor editor, @NotNull ExecutionContext context, @NotNull OperatorArguments operatorArguments) {
-      @NotNull KeyHandler keyHandler = KeyHandler.getInstance();
       @NotNull KeyHandlerState keyHandlerState = KeyHandler.getInstance().getKeyHandlerState();
-      int count = Math.max(1, keyHandlerState.getCommandBuilder().getCount());
 
       final ArgumentTextObjectHandler textObjectHandler = new ArgumentTextObjectHandler(isInner);
       //noinspection DuplicatedCode
-      if (!keyHandler.isOperatorPending(editor.getMode(), keyHandlerState)) {
+      if (!(editor.getMode() instanceof Mode.OP_PENDING)) {
+        int count0 = operatorArguments.getCount0();
         editor.nativeCarets().forEach((VimCaret caret) -> {
-          final TextRange range = textObjectHandler.getRange(editor, caret, context, count, 0);
+          final TextRange range = textObjectHandler.getRange(editor, caret, context, Math.max(1, count0), count0);
           if (range != null) {
             try (VimListenerSuppressor.Locked ignored = SelectionVimListenerSuppressor.INSTANCE.lock()) {
               if (editor.getMode() instanceof Mode.VISUAL) {
@@ -265,8 +259,7 @@ public class VimArgTextObjExtension implements VimExtension {
           }
         });
       } else {
-        keyHandlerState.getCommandBuilder().completeCommandPart(new Argument(new Command(count,
-                                                                                         textObjectHandler, Command.Type.MOTION, EnumSet.noneOf(CommandFlags.class))));
+        keyHandlerState.getCommandBuilder().addAction(textObjectHandler);
       }
     }
   }
@@ -276,9 +269,9 @@ public class VimArgTextObjExtension implements VimExtension {
    * position
    */
   private static class ArgBoundsFinder {
-    @NotNull private final CharSequence text;
-    @NotNull private final Document document;
-    @NotNull private final BracketPairs brackets;
+    private final @NotNull CharSequence text;
+    private final @NotNull Document document;
+    private final @NotNull BracketPairs brackets;
     private int leftBound = Integer.MAX_VALUE;
     private int rightBound = Integer.MIN_VALUE;
     private int leftBracket;
@@ -305,7 +298,7 @@ public class VimArgTextObjExtension implements VimExtension {
      * @param position starting position.
      */
     boolean findBoundsAt(int position) throws IllegalStateException {
-      if (text.length() == 0) {
+      if (text.isEmpty()) {
         error = "empty document";
         return false;
       }

src/main/java/com/maddyhome/idea/vim/extension/commentary/CommentaryExtension.kt

@@ -25,9 +25,6 @@ import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.getLineEndOffset
 import com.maddyhome.idea.vim.api.globalOptions
 import com.maddyhome.idea.vim.api.injector
-import com.maddyhome.idea.vim.command.Argument
-import com.maddyhome.idea.vim.command.Command
-import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.MappingMode
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.command.TextObjectVisualType
@@ -52,7 +49,6 @@ import com.maddyhome.idea.vim.newapi.ij
 import com.maddyhome.idea.vim.newapi.vim
 import com.maddyhome.idea.vim.state.mode.Mode
 import com.maddyhome.idea.vim.state.mode.SelectionType
-import java.util.*
 
 internal class CommentaryExtension : VimExtension {
 
@@ -184,10 +180,8 @@ internal class CommentaryExtension : VimExtension {
     override val isRepeatable = true
 
     override fun execute(editor: VimEditor, context: ExecutionContext, operatorArguments: OperatorArguments) {
-      val command = Command(operatorArguments.count1, CommentaryTextObjectMotionHandler, Command.Type.MOTION, EnumSet.noneOf(CommandFlags::class.java))
-
       val keyState = KeyHandler.getInstance().keyHandlerState
-      keyState.commandBuilder.completeCommandPart(Argument(command))
+      keyState.commandBuilder.addAction(CommentaryTextObjectMotionHandler)
     }
   }
 

src/main/java/com/maddyhome/idea/vim/extension/matchit/Matchit.kt

@@ -44,6 +44,7 @@ import com.maddyhome.idea.vim.helper.enumSetOf
 import com.maddyhome.idea.vim.newapi.IjVimEditor
 import com.maddyhome.idea.vim.newapi.ij
 import com.maddyhome.idea.vim.newapi.vim
+import com.maddyhome.idea.vim.state.mode.Mode
 import java.util.*
 import java.util.regex.Pattern
 
@@ -93,34 +94,29 @@ internal class Matchit : VimExtension {
     override fun execute(editor: VimEditor, context: ExecutionContext, operatorArguments: OperatorArguments) {
       val keyHandler = KeyHandler.getInstance()
       val keyState = keyHandler.keyHandlerState
-      val count = keyState.commandBuilder.count
 
       // Reset the command count so it doesn't transfer onto subsequent commands.
       keyState.commandBuilder.resetCount()
 
       // Normally we want to jump to the start of the matching pair. But when moving forward in operator
       // pending mode, we want to include the entire match. isInOpPending makes that distinction.
-      val isInOpPending = keyHandler.isOperatorPending(editor.mode, keyState)
-
-      if (isInOpPending) {
+      if (editor.mode is Mode.OP_PENDING) {
         val matchitAction = MatchitAction()
         matchitAction.reverse = reverse
         matchitAction.isInOpPending = true
 
-        keyState.commandBuilder.completeCommandPart(
-          Argument(
-            Command(
-              count,
-              matchitAction,
-              Command.Type.MOTION,
-              EnumSet.noneOf(CommandFlags::class.java),
-            ),
-          ),
-        )
+        keyState.commandBuilder.addAction(matchitAction)
       } else {
         editor.sortedCarets().forEach { caret ->
           injector.jumpService.saveJumpLocation(editor)
-          caret.moveToOffset(getMatchitOffset(editor.ij, caret.ij, count, isInOpPending, reverse))
+          caret.moveToOffset(
+            getMatchitOffset(
+              editor.ij,
+              caret.ij,
+              operatorArguments.count0,
+              isInOpPending = false,
+              reverse
+            ))
         }
       }
     }
@@ -354,7 +350,7 @@ private object FileTypePatterns {
 
 private val DEFAULT_PAIRS = setOf('(', ')', '[', ']', '{', '}')
 
-private fun getMatchitOffset(editor: Editor, caret: Caret, count: Int, isInOpPending: Boolean, reverse: Boolean): Int {
+private fun getMatchitOffset(editor: Editor, caret: Caret, count0: Int, isInOpPending: Boolean, reverse: Boolean): Int {
   val virtualFile = EditorHelper.getVirtualFile(editor)
   var caretOffset = caret.offset
 
@@ -367,9 +363,9 @@ private fun getMatchitOffset(editor: Editor, caret: Caret, count: Int, isInOpPen
   val currentChar = editor.document.charsSequence[caretOffset]
   var motionOffset: Int? = null
 
-  if (count > 0) {
+  if (count0 > 0) {
     // Matchit doesn't affect the percent motion, so we fall back to the default behavior.
-    motionOffset = VimPlugin.getMotion().moveCaretToLinePercent(editor.vim, caret.vim, count)
+    motionOffset = VimPlugin.getMotion().moveCaretToLinePercent(editor.vim, caret.vim, count0)
   } else {
     // Check the simplest case first.
     if (DEFAULT_PAIRS.contains(currentChar)) {
@@ -400,8 +396,7 @@ private fun getMatchitOffset(editor: Editor, caret: Caret, count: Int, isInOpPen
 
 private fun getMotionOffset(motion: Motion): Int? {
   return when (motion) {
-    is Motion.AbsoluteOffset -> motion.offset
-    is Motion.AdjustedOffset -> motion.offset
+    is Motion.AdjustedOffset, is Motion.AbsoluteOffset -> motion.offset
     is Motion.Error, is Motion.NoMotion -> null
   }
 }

src/main/java/com/maddyhome/idea/vim/extension/nerdtree/NerdTree.kt

@@ -555,12 +555,13 @@ private fun registerCommand(default: String, action: NerdAction) {
 }
 
 
-private val actionsRoot: RootNode<NerdAction> = RootNode()
+private val actionsRoot: RootNode<NerdAction> = RootNode("NERDTree")
 private var currentNode: CommandPartNode<NerdAction> = actionsRoot
+
 private fun collectShortcuts(node: Node<NerdAction>): Set<KeyStroke> {
   return if (node is CommandPartNode<NerdAction>) {
-    val res = node.keys.toMutableSet()
-    res += node.values.map { collectShortcuts(it) }.flatten()
+    val res = node.children.keys.toMutableSet()
+    res += node.children.values.map { collectShortcuts(it) }.flatten()
     res
   } else {
     emptySet()

src/main/java/com/maddyhome/idea/vim/extension/replacewithregister/ReplaceWithRegister.kt

@@ -10,7 +10,6 @@ package com.maddyhome.idea.vim.extension.replacewithregister
 
 import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.editor.Editor
-import com.maddyhome.idea.vim.KeyHandler
 import com.maddyhome.idea.vim.VimPlugin
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.ImmutableVimCaret
@@ -166,17 +165,11 @@ private fun doReplace(editor: Editor, context: DataContext, caret: ImmutableVimC
     putToLine = -1,
   )
   val vimEditor = editor.vim
-  val keyHandler = KeyHandler.getInstance()
   ClipboardOptionHelper.IdeaputDisabler().use {
     VimPlugin.getPut().putText(
       vimEditor,
       context.vim,
       putData,
-      operatorArguments = OperatorArguments(
-        keyHandler.isOperatorPending(vimEditor.mode, keyHandler.keyHandlerState),
-        0,
-        editor.vim.mode,
-      ),
       saveToRegister = false
     )
   }

src/main/java/com/maddyhome/idea/vim/extension/textobjentire/VimTextObjEntireExtension.java

@@ -29,14 +29,12 @@ import com.maddyhome.idea.vim.state.mode.Mode;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.EnumSet;
-
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putExtensionHandlerMapping;
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putKeyMappingIfMissing;
 
 /**
  * Port of vim-entire:
- * https://github.com/kana/vim-textobj-entire
+ * <a href="https://github.com/kana/vim-textobj-entire">vim-textobj-entire</a>
  *
  * <p>
  * vim-textobj-entire provides two text objects:
@@ -51,7 +49,7 @@ import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putKeyMappingI
  * </ul>
  *
  * See also the reference manual for more details at:
- * https://github.com/kana/vim-textobj-entire/blob/master/doc/textobj-entire.txt
+ * <a href="https://github.com/kana/vim-textobj-entire/blob/master/doc/textobj-entire.txt">text-obj-entire.txt</a>
  *
  * @author Alexandre Grison (@agrison)
  */
@@ -94,9 +92,8 @@ public class VimTextObjEntireExtension implements VimExtension {
         this.ignoreLeadingAndTrailing = ignoreLeadingAndTrailing;
       }
 
-      @Nullable
       @Override
-      public TextRange getRange(@NotNull VimEditor editor,
+      public @Nullable TextRange getRange(@NotNull VimEditor editor,
                                           @NotNull ImmutableVimCaret caret,
                                           @NotNull ExecutionContext context,
                                           int count,
@@ -125,24 +122,22 @@ public class VimTextObjEntireExtension implements VimExtension {
         return new TextRange(start, end);
       }
 
-      @NotNull
       @Override
-      public TextObjectVisualType getVisualType() {
+      public @NotNull TextObjectVisualType getVisualType() {
         return TextObjectVisualType.CHARACTER_WISE;
       }
     }
 
     @Override
     public void execute(@NotNull VimEditor editor, @NotNull ExecutionContext context, @NotNull OperatorArguments operatorArguments) {
-      @NotNull KeyHandler keyHandler = KeyHandler.getInstance();
       @NotNull KeyHandlerState keyHandlerState = KeyHandler.getInstance().getKeyHandlerState();
-      int count = Math.max(1, keyHandlerState.getCommandBuilder().getCount());
 
       final EntireTextObjectHandler textObjectHandler = new EntireTextObjectHandler(ignoreLeadingAndTrailing);
       //noinspection DuplicatedCode
-      if (!keyHandler.isOperatorPending(editor.getMode(), keyHandlerState)) {
+      if (!(editor.getMode() instanceof Mode.OP_PENDING)) {
+        int count0 = operatorArguments.getCount0();
         ((IjVimEditor) editor).getEditor().getCaretModel().runForEachCaret((Caret caret) -> {
-          final TextRange range = textObjectHandler.getRange(editor, new IjVimCaret(caret), context, count, 0);
+          final TextRange range = textObjectHandler.getRange(editor, new IjVimCaret(caret), context, Math.max(1, count0), count0);
           if (range != null) {
             try (VimListenerSuppressor.Locked ignored = SelectionVimListenerSuppressor.INSTANCE.lock()) {
               if (editor.getMode() instanceof Mode.VISUAL) {
@@ -155,9 +150,7 @@ public class VimTextObjEntireExtension implements VimExtension {
 
         });
       } else {
-        keyHandlerState.getCommandBuilder().completeCommandPart(new Argument(new Command(count,
-                                                                                         textObjectHandler, Command.Type.MOTION,
-                                                                                         EnumSet.noneOf(CommandFlags.class))));
+        keyHandlerState.getCommandBuilder().addAction(textObjectHandler);
       }
     }
   }

src/main/java/com/maddyhome/idea/vim/extension/textobjindent/VimIndentObject.java

@@ -30,14 +30,12 @@ import com.maddyhome.idea.vim.state.mode.Mode;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.EnumSet;
-
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putExtensionHandlerMapping;
 import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putKeyMapping;
 
 /**
  * Port of vim-indent-object:
- * https://github.com/michaeljsmith/vim-indent-object
+ * <a href="https://github.com/michaeljsmith/vim-indent-object">vim-indent-object</a>
  *
  * <p>
  * vim-indent-object provides these text objects based on the cursor line's indentation:
@@ -49,7 +47,7 @@ import static com.maddyhome.idea.vim.extension.VimExtensionFacade.putKeyMapping;
  * </ul>
  *
  * See also the reference manual for more details at:
- * https://github.com/michaeljsmith/vim-indent-object/blob/master/doc/indent-object.txt
+ * <a href="https://github.com/michaeljsmith/vim-indent-object/blob/master/doc/indent-object.txt">indent-object.txt</a>
  *
  * @author Shrikant Kandula (@sharat87)
  */
@@ -98,9 +96,8 @@ public class VimIndentObject implements VimExtension {
         this.includeBelow = includeBelow;
       }
 
-      @Nullable
       @Override
-      public TextRange getRange(@NotNull VimEditor editor,
+      public @Nullable TextRange getRange(@NotNull VimEditor editor,
                                           @NotNull ImmutableVimCaret caret,
                                           @NotNull ExecutionContext context,
                                           int count,
@@ -249,9 +246,8 @@ public class VimIndentObject implements VimExtension {
         return new TextRange(upperBoundaryOffset, lowerBoundaryOffset);
       }
 
-      @NotNull
       @Override
-      public TextObjectVisualType getVisualType() {
+      public @NotNull TextObjectVisualType getVisualType() {
         return TextObjectVisualType.LINE_WISE;
       }
 
@@ -264,15 +260,14 @@ public class VimIndentObject implements VimExtension {
     @Override
     public void execute(@NotNull VimEditor editor, @NotNull ExecutionContext context, @NotNull OperatorArguments operatorArguments) {
       IjVimEditor vimEditor = (IjVimEditor)editor;
-      @NotNull KeyHandler keyHandler = KeyHandler.getInstance();
       @NotNull KeyHandlerState keyHandlerState = KeyHandler.getInstance().getKeyHandlerState();
-      int count = Math.max(1, keyHandlerState.getCommandBuilder().getCount());
 
       final IndentObjectHandler textObjectHandler = new IndentObjectHandler(includeAbove, includeBelow);
 
-      if (!keyHandler.isOperatorPending(editor.getMode(), keyHandlerState)) {
+      if (!(editor.getMode() instanceof Mode.OP_PENDING)) {
+        int count0 = operatorArguments.getCount0();
         ((IjVimEditor)editor).getEditor().getCaretModel().runForEachCaret((Caret caret) -> {
-          final TextRange range = textObjectHandler.getRange(vimEditor, new IjVimCaret(caret), context, count, 0);
+          final TextRange range = textObjectHandler.getRange(vimEditor, new IjVimCaret(caret), context, Math.max(1, count0), count0);
           if (range != null) {
             try (VimListenerSuppressor.Locked ignored = SelectionVimListenerSuppressor.INSTANCE.lock()) {
               if (editor.getMode() instanceof Mode.VISUAL) {
@@ -285,9 +280,7 @@ public class VimIndentObject implements VimExtension {
 
         });
       } else {
-        keyHandlerState.getCommandBuilder().completeCommandPart(new Argument(new Command(count,
-                                                                                         textObjectHandler, Command.Type.MOTION,
-                                                                                         EnumSet.noneOf(CommandFlags.class))));
+        keyHandlerState.getCommandBuilder().addAction(textObjectHandler);
       }
     }
   }

src/main/java/com/maddyhome/idea/vim/group/ChangeGroup.kt

@@ -103,6 +103,11 @@ class ChangeGroup : VimChangeGroupBase() {
     }
   }
 
+  override fun processBackspace(editor: VimEditor, context: ExecutionContext) {
+    injector.actionExecutor.executeAction(editor, name = IdeActions.ACTION_EDITOR_BACKSPACE, context = context)
+    injector.scroll.scrollCaretIntoView(editor)
+  }
+
   private fun restoreCursor(editor: VimEditor, caret: VimCaret, startLine: Int) {
     if (caret != editor.primaryCaret()) {
       (editor as IjVimEditor).editor.caretModel.addCaret(

src/main/java/com/maddyhome/idea/vim/group/MotionGroup.kt

@@ -35,7 +35,7 @@ import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.TextRange
-import com.maddyhome.idea.vim.ex.ExOutputModel
+import com.maddyhome.idea.vim.handler.ExternalActionHandler
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.Motion.AbsoluteOffset
 import com.maddyhome.idea.vim.handler.MotionActionHandler
@@ -193,21 +193,16 @@ internal class MotionGroup : VimMotionGroupBase() {
       argument: Argument,
       operatorArguments: OperatorArguments,
     ): TextRange? {
+      if (argument !is Argument.Motion) {
+        throw RuntimeException("Unexpected argument passed to getMotionRange2: $argument")
+      }
+
       var start: Int
       var end: Int
-      if (argument.type === Argument.Type.OFFSETS) {
-        val offsets = argument.offsets[caret.vim] ?: return null
-        val (first, second) = offsets.getNativeStartAndEnd()
-        start = first
-        end = second
-      } else {
-        val cmd = argument.motion
-        // Normalize the counts between the command and the motion argument
-        val cnt = cmd.count * operatorArguments.count1
-        val raw = if (operatorArguments.count0 == 0 && cmd.rawCount == 0) 0 else cnt
-        if (cmd.action is MotionActionHandler) {
-          val action = cmd.action as MotionActionHandler
 
+      val action = argument.motion
+      when (action) {
+        is MotionActionHandler -> {
           // This is where we are now
           start = caret.offset
 
@@ -216,8 +211,8 @@ internal class MotionGroup : VimMotionGroupBase() {
             editor.vim,
             caret.vim,
             IjEditorExecutionContext(context!!),
-            cmd.argument,
-            operatorArguments.withCount0(raw),
+            argument.argument,
+            operatorArguments
           )
 
           // Invalid motion
@@ -233,22 +228,32 @@ internal class MotionGroup : VimMotionGroupBase() {
               end++
             }
           }
-        } else if (cmd.action is TextObjectActionHandler) {
-          val action = cmd.action as TextObjectActionHandler
-          val range =
-            action.getRange(editor.vim, caret.vim, IjEditorExecutionContext(context!!), cnt, raw) ?: return null
+        }
+
+        is TextObjectActionHandler -> {
+          val range = action.getRange(
+            editor.vim,
+            caret.vim,
+            IjEditorExecutionContext(context!!),
+            operatorArguments.count1,
+            operatorArguments.count0
+          ) ?: return null
           start = range.startOffset
           end = range.endOffset
-          if (cmd.isLinewiseMotion()) end--
-        } else {
-          throw RuntimeException(
-            "Commands doesn't take " + cmd.action.javaClass.simpleName + " as an operator",
-          )
+          if (argument.isLinewiseMotion()) end--
         }
+
+        is ExternalActionHandler -> {
+          val range = action.getRange(caret.vim) ?: return null
+          start = range.startOffset
+          end = range.endOffset
+        }
+
+        else -> throw RuntimeException("Commands doesn't take " + action.javaClass.simpleName + " as an operator")
       }
 
       // This is a kludge for dw, dW, and d[w. Without this kludge, an extra newline is operated when it shouldn't be.
-      val id = argument.motion.action.id
+      val id = argument.motion.id
       if (id == VimChangeGroupBase.VIM_MOTION_WORD_RIGHT || id == VimChangeGroupBase.VIM_MOTION_BIG_WORD_RIGHT || id == VimChangeGroupBase.VIM_MOTION_CAMEL_RIGHT) {
         val text = editor.document.charsSequence.subSequence(start, end).toString()
         val lastNewLine = text.lastIndexOf('\n')
@@ -258,6 +263,7 @@ internal class MotionGroup : VimMotionGroupBase() {
           }
         }
       }
+
       return TextRange(start, end)
     }
 

src/main/java/com/maddyhome/idea/vim/helper/IjActionExecutor.kt

@@ -62,6 +62,7 @@ internal class IjActionExecutor : VimActionExecutor {
   override val ACTION_EXPAND_REGION_RECURSIVELY: String
     get() = IdeActions.ACTION_EXPAND_REGION_RECURSIVELY
   override val ACTION_EXPAND_COLLAPSE_TOGGLE: String
+    // [VERSION UPDATE] 2024.3+ Replace raw "ExpandCollapseToggleAction" with IdeActions.ACTION_EXPAND_COLLAPSE_TOGGLE_REGION from the platform.
     get() = "ExpandCollapseToggleAction"
 
   /**

src/main/java/com/maddyhome/idea/vim/helper/ModeExtensions.kt

@@ -16,7 +16,6 @@ import com.maddyhome.idea.vim.VimPlugin
 import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.getLineEndForOffset
 import com.maddyhome.idea.vim.api.getLineStartForOffset
-import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.listener.SelectionVimListenerSuppressor
 import com.maddyhome.idea.vim.newapi.IjEditorExecutionContext
 import com.maddyhome.idea.vim.newapi.IjVimCaret
@@ -94,6 +93,6 @@ internal fun VimEditor.exitSelectMode(adjustCaretPosition: Boolean) {
   }
 }
 
-internal fun Editor.exitInsertMode(context: DataContext, operatorArguments: OperatorArguments) {
-  VimPlugin.getChange().processEscape(IjVimEditor(this), IjEditorExecutionContext(context), operatorArguments)
+internal fun Editor.exitInsertMode(context: DataContext) {
+  VimPlugin.getChange().processEscape(IjVimEditor(this), IjEditorExecutionContext(context))
 }

src/main/java/com/maddyhome/idea/vim/helper/UserDataManager.kt

@@ -24,7 +24,9 @@ import com.maddyhome.idea.vim.common.InsertSequence
 import com.maddyhome.idea.vim.ex.ExOutputModel
 import com.maddyhome.idea.vim.group.visual.VisualChange
 import com.maddyhome.idea.vim.group.visual.vimLeadSelectionOffset
+import com.maddyhome.idea.vim.common.VimEditorReplaceMask
 import com.maddyhome.idea.vim.newapi.vim
+import com.maddyhome.idea.vim.state.VimStateMachine
 import com.maddyhome.idea.vim.state.mode.Mode
 import com.maddyhome.idea.vim.state.mode.SelectionType
 import com.maddyhome.idea.vim.ui.ExOutputPanel
@@ -123,6 +125,7 @@ internal var Editor.vimExOutput: ExOutputModel? by userData()
 internal var Editor.vimTestInputModel: TestInputModel? by userData()
 
 internal var Editor.vimChangeActionSwitchMode: Mode? by userData()
+internal var Editor.replaceMask: VimEditorReplaceMask? by userData()
 
 internal var Caret.currentInsert: InsertSequence? by userData()
 internal val Caret.insertHistory: MutableList<InsertSequence> by userDataOr { mutableListOf() }

src/main/java/com/maddyhome/idea/vim/listener/IJEditorFocusListener.kt

@@ -15,7 +15,6 @@ import com.maddyhome.idea.vim.VimPlugin
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
-import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.EditorListener
 import com.maddyhome.idea.vim.helper.inInsertMode
 import com.maddyhome.idea.vim.newapi.ij
@@ -65,7 +64,7 @@ class IJEditorFocusListener : EditorListener {
       val context: ExecutionContext = injector.executionContextManager.getEditorExecutionContext(editor)
       val mode = injector.vimState.mode
       when (mode) {
-        is Mode.INSERT -> editor.exitInsertMode(context, OperatorArguments(false, 0, mode))
+        is Mode.INSERT -> editor.exitInsertMode(context)
         else -> {}
       }
     }
@@ -79,3 +78,4 @@ class IJEditorFocusListener : EditorListener {
     KeyHandler.getInstance().reset(editor)
   }
 }
+

src/main/java/com/maddyhome/idea/vim/listener/IdeaSpecifics.kt

@@ -16,7 +16,9 @@ import com.intellij.codeInsight.lookup.impl.actions.ChooseItemAction
 import com.intellij.codeInsight.template.Template
 import com.intellij.codeInsight.template.TemplateEditingAdapter
 import com.intellij.codeInsight.template.TemplateManagerListener
+import com.intellij.codeInsight.template.impl.TemplateManagerImpl
 import com.intellij.codeInsight.template.impl.TemplateState
+import com.intellij.codeInsight.template.impl.actions.NextVariableAction
 import com.intellij.find.FindModelListener
 import com.intellij.openapi.actionSystem.ActionManager
 import com.intellij.openapi.actionSystem.ActionUpdateThread
@@ -152,6 +154,10 @@ internal object IdeaSpecifics {
             KeyHandler.getInstance().reset(it.vim)
           }
         }
+        else if (action is NextVariableAction && TemplateManagerImpl.getTemplateState(editor) == null) {
+          editor.vim.exitInsertMode(event.dataContext.vim)
+          KeyHandler.getInstance().reset(editor.vim)
+        }
         //endregion
 
         if (caretOffset != -1 && caretOffset != editor.caretModel.offset) {

src/main/java/com/maddyhome/idea/vim/listener/VimListenerManager.kt

@@ -66,7 +66,6 @@ import com.maddyhome.idea.vim.api.coerceOffset
 import com.maddyhome.idea.vim.api.getLineEndForOffset
 import com.maddyhome.idea.vim.api.getLineStartForOffset
 import com.maddyhome.idea.vim.api.injector
-import com.maddyhome.idea.vim.ex.ExOutputModel
 import com.maddyhome.idea.vim.group.EditorGroup
 import com.maddyhome.idea.vim.group.FileGroup
 import com.maddyhome.idea.vim.group.IjOptions
@@ -395,7 +394,8 @@ internal object VimListenerManager {
           editor.vim.mode = Mode.NORMAL()
           KeyHandler.getInstance().reset(editor.vim)
         }
-        injector.scroll.scrollCaretIntoView(editor.vim)
+        // Breaks relativenumber for some reason
+//        injector.scroll.scrollCaretIntoView(editor.vim)
       }
       
       MotionGroup.fileEditorManagerSelectionChangedCallback(event)

src/main/java/com/maddyhome/idea/vim/newapi/IjLiveRange.kt

@@ -17,6 +17,24 @@ internal class IjLiveRange(val marker: RangeMarker) : LiveRange {
 
   override val endOffset: Int
     get() = marker.endOffset
+
+  override fun equals(other: Any?): Boolean {
+    if (this === other) return true
+    if (javaClass != other?.javaClass) return false
+
+    other as IjLiveRange
+
+    if (startOffset != other.startOffset) return false
+    if (endOffset != other.endOffset) return false
+
+    return true
+  }
+
+  override fun hashCode(): Int {
+    var result = startOffset
+    result = 31 * result + endOffset
+    return result
+  }
 }
 
 val RangeMarker.vim: LiveRange

src/main/java/com/maddyhome/idea/vim/newapi/IjVimEditor.kt

@@ -38,12 +38,12 @@ import com.maddyhome.idea.vim.api.VimSelectionModel
 import com.maddyhome.idea.vim.api.VimVisualPosition
 import com.maddyhome.idea.vim.api.VirtualFile
 import com.maddyhome.idea.vim.api.injector
-import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.IndentConfig
-import com.maddyhome.idea.vim.common.IndentConfig.Companion.create
 import com.maddyhome.idea.vim.common.LiveRange
 import com.maddyhome.idea.vim.common.ModeChangeListener
 import com.maddyhome.idea.vim.common.TextRange
+import com.maddyhome.idea.vim.common.VimEditorReplaceMask
+import com.maddyhome.idea.vim.common.forgetAllReplaceMasks
 import com.maddyhome.idea.vim.group.visual.vimSetSystemBlockSelectionSilently
 import com.maddyhome.idea.vim.helper.EditorHelper
 import com.maddyhome.idea.vim.helper.StrictMode
@@ -53,6 +53,7 @@ import com.maddyhome.idea.vim.helper.fileSize
 import com.maddyhome.idea.vim.helper.getTopLevelEditor
 import com.maddyhome.idea.vim.helper.inExMode
 import com.maddyhome.idea.vim.helper.isTemplateActive
+import com.maddyhome.idea.vim.helper.replaceMask
 import com.maddyhome.idea.vim.helper.vimChangeActionSwitchMode
 import com.maddyhome.idea.vim.helper.vimLastSelectionType
 import com.maddyhome.idea.vim.impl.state.VimStateMachineImpl
@@ -75,6 +76,11 @@ internal class IjVimEditor(editor: Editor) : MutableLinearEditor, VimEditorBase(
   // TBH, I don't like the names. Need to think a bit more about this
   val editor = editor.getTopLevelEditor()
   val originalEditor = editor
+  override var replaceMask: VimEditorReplaceMask?
+    get() = editor.replaceMask
+    set(value) {
+      editor.replaceMask = value
+    }
 
   override fun updateMode(mode: Mode) {
     (injector.vimState as VimStateMachineImpl).mode = mode
@@ -91,7 +97,7 @@ internal class IjVimEditor(editor: Editor) : MutableLinearEditor, VimEditorBase(
       editor.vimChangeActionSwitchMode = value
     }
   override val indentConfig: VimIndentConfig
-    get() = create(editor)
+    get() = IndentConfig.create(editor)
 
   override fun fileSize(): Long = editor.fileSize.toLong()
 
@@ -398,8 +404,8 @@ internal class IjVimEditor(editor: Editor) : MutableLinearEditor, VimEditorBase(
     return editor.visualPositionToOffset(VisualPosition(position.line, position.column, position.leansRight))
   }
 
-  override fun exitInsertMode(context: ExecutionContext, operatorArguments: OperatorArguments) {
-    editor.exitInsertMode(context.ij, operatorArguments)
+  override fun exitInsertMode(context: ExecutionContext) {
+    editor.exitInsertMode(context.ij)
   }
 
   override fun exitSelectModeNative(adjustCaret: Boolean) {
@@ -471,6 +477,7 @@ internal class IjVimEditor(editor: Editor) : MutableLinearEditor, VimEditorBase(
     get() = (editor as? EditorEx)?.isInsertMode ?: false
     set(value) {
       (editor as? EditorEx)?.isInsertMode = value
+      forgetAllReplaceMasks()
     }
 
   override val document: VimDocument

src/main/java/com/maddyhome/idea/vim/ui/StatusBar.kt

@@ -192,6 +192,13 @@ private object VimActionsPopup {
         null,
       ),
     )
+    actionGroup.add(
+      HelpLink(
+        "Take Survey ↗",
+        "https://surveys.jetbrains.com/s3/ideavim-usage-survey",
+        AllIcons.Actions.IntentionBulb,
+      ),
+    )
     actionGroup.addSeparator(MessageHelper.message("action.eap.choice.active.text"))
 
     actionGroup.add(JoinEap)

src/main/java/com/maddyhome/idea/vim/ui/ex/ExEntryPanel.java

@@ -344,12 +344,12 @@ public class ExEntryPanel extends JPanel implements VimCommandLine {
           }
         }
 
-        // Get the current count from the command builder. This value is coerced to at least 1, so will always be valid.
-        // The aggregated value includes any counts for operator and register selections, and the uncommitted count for
-        // the search command (`/` or `?`). E.g., `2"a3"b4"c5d6/` would return 720.
-        // If we're showing highlights for an ex command like `:s`, there won't be a command, but the value is already
-        // coerced to at least 1.
-        int count1 = KeyHandler.getInstance().getKeyHandlerState().getEditorCommandBuilder().getAggregatedUncommittedCount();
+        // Get a snapshot of the count for the in progress command, and coerce it to 1. This value will include all
+        // count components - selecting register(s), operator and motions. E.g. `2"a3"b4"c5d6/` will return 720.
+        // If we're showing highlights for an Ex command like `:s`, the command builder will be empty, but we'll still
+        // get a valid value.
+        int count1 = Math.max(1, KeyHandler.getInstance().getKeyHandlerState().getEditorCommandBuilder()
+          .calculateCount0Snapshot());
 
         if ((labelText.equals("/") || labelText.equals("?") || searchCommand) && !injector.getMacro().isExecutingMacro()) {
           final boolean forwards = !labelText.equals("?");  // :s, :g, :v are treated as forwards
@@ -531,9 +531,8 @@ public class ExEntryPanel extends JPanel implements VimCommandLine {
 
   private static final Logger logger = Logger.getInstance(ExEntryPanel.class.getName());
 
-  @NotNull
   @Override
-  public VimCommandLineCaret getCaret() {
+  public @NotNull VimCommandLineCaret getCaret() {
     return (VimCommandLineCaret) entry.getCaret();
   }
 
@@ -551,9 +550,8 @@ public class ExEntryPanel extends JPanel implements VimCommandLine {
     entry.clearCurrentAction();
   }
 
-  @Nullable
   @Override
-  public Integer getPromptCharacterOffset() {
+  public @Nullable Integer getPromptCharacterOffset() {
     int offset = entry.currentActionPromptCharacterOffset;
     return offset == -1 ? null : offset;
   }
@@ -573,8 +571,7 @@ public class ExEntryPanel extends JPanel implements VimCommandLine {
     IdeFocusManager.findInstance().requestFocus(entry, true);
   }
 
-  @Nullable
-  public VimInputInterceptor<?> getInputInterceptor() {
+  public @Nullable VimInputInterceptor<?> getInputInterceptor() {
     return myInputInterceptor;
   }
 
@@ -587,15 +584,13 @@ public class ExEntryPanel extends JPanel implements VimCommandLine {
     myInputInterceptor = vimInputInterceptor;
   }
 
-  @Nullable
   @Override
-  public Function1<String, Unit> getInputProcessing() {
+  public @Nullable Function1<String, Unit> getInputProcessing() {
     return inputProcessing;
   }
 
-  @Nullable
   @Override
-  public Character getFinishOn() {
+  public @Nullable Character getFinishOn() {
     return finishOn;
   }
 

src/main/resources/dictionaries/ideavim.dic

@@ -44,6 +44,7 @@ viminfo
 virtualedit
 visualbell
 visualdelay
+whichwrap
 wrapscan
 
 nobomb

src/main/resources/ksp-generated/intellij_commands.json

@@ -4,16 +4,6 @@
         "class": "com.maddyhome.idea.vim.action.change.RepeatChangeAction",
         "modes": "N"
     },
-    {
-        "keys": "<BS>",
-        "class": "com.maddyhome.idea.vim.action.editor.VimEditorBackSpace",
-        "modes": "I"
-    },
-    {
-        "keys": "<C-H>",
-        "class": "com.maddyhome.idea.vim.action.editor.VimEditorBackSpace",
-        "modes": "I"
-    },
     {
         "keys": "<C-I>",
         "class": "com.maddyhome.idea.vim.action.editor.VimEditorTab",

src/test/java/org/jetbrains/plugins/ideavim/action/ChangeActionTest.kt

@@ -7,6 +7,7 @@
  */
 package org.jetbrains.plugins.ideavim.action
 
+import com.intellij.idea.TestFor
 import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.state.mode.Mode
 import com.maddyhome.idea.vim.state.mode.ReturnTo
@@ -1068,4 +1069,14 @@ foobaz
       Mode.NORMAL(),
     )
   }
+
+  @Test
+  @TestFor(issues = ["VIM-2074"])
+  fun `backspace with replace mode`() {
+    configureByText("${c}Hello world")
+    typeText("R1111")
+    assertState("1111o world")
+    typeText("<BS><BS><BS>")
+    assertState("1ello world")
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/action/CopyActionTest.kt

@@ -109,7 +109,7 @@ class CopyActionTest : VimTestCase() {
   @TestWithoutNeovim(reason = SkipNeovimReason.DIFFERENT)
   @Test
   fun testYankRegisterUsesLastEnteredRegister() {
-    typeTextInFile("\"a\"byl" + "\"ap", "hel<caret>lo world\n")
+    typeTextInFile("\"a\"byl" + "\"bp", "hel<caret>lo world\n")
     assertState("helllo world\n")
   }
 

src/test/java/org/jetbrains/plugins/ideavim/action/motion/leftright/MotionBackspaceActionTest.kt

@@ -85,4 +85,33 @@ class MotionBackspaceActionTest : VimTestCase() {
       enterCommand("set whichwrap=b")
     }
   }
+
+  @TestWithoutNeovim(SkipNeovimReason.OPTION)
+  @Test
+  fun `test backspace motion with operator`() {
+    doTest(
+      "d<BS>",
+      """
+        lorem ${c}ipsum dolor sit amet
+      """.trimIndent(),
+      """
+        lorem${c}ipsum dolor sit amet
+      """.trimIndent(),
+    )
+  }
+
+  @TestWithoutNeovim(SkipNeovimReason.OPTION)
+  @Test
+  fun `test backspace motion with operator at start of line`() {
+    doTest(
+      "d<BS>",
+      """
+        lorem ipsum dolor sit amet
+        ${c}lorem ipsum dolor sit amet
+      """.trimIndent(),
+      """
+        lorem ipsum dolor sit amet${c}lorem ipsum dolor sit amet
+      """.trimIndent(),
+    )
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/action/motion/leftright/MotionSpaceActionTest.kt

@@ -85,4 +85,35 @@ class MotionSpaceActionTest : VimTestCase() {
       enterCommand("set whichwrap=s")
     }
   }
+
+  @Suppress("SpellCheckingInspection")
+  @TestWithoutNeovim(SkipNeovimReason.OPTION)
+  @Test
+  fun `test space motion with operator`() {
+    doTest(
+      "d<Space>",
+      """
+        lorem ${c}ipsum dolor sit amet
+      """.trimIndent(),
+      """
+        lorem ${c}psum dolor sit amet
+      """.trimIndent(),
+    )
+  }
+
+  @TestWithoutNeovim(SkipNeovimReason.OPTION)
+  @Test
+  fun `test space motion with operator at end of line`() {
+    doTest(
+      "d<Space>",
+      """
+        lorem ipsum dolor sit ame${c}t
+        lorem ipsum dolor sit amet
+      """.trimIndent(),
+      """
+        lorem ipsum dolor sit am${c}e
+        lorem ipsum dolor sit amet
+      """.trimIndent(),
+    )
+  }
 }

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/services/VimVariableServiceTest.kt

@@ -15,7 +15,7 @@ class VimVariableServiceTest : VimTestCase() {
   @Test
   fun `test v count variable without count specified`() {
     configureByText("\n")
-    enterCommand("nnoremap <expr> n ':echo ' .. v:count .. \"\\<CR>\"")
+    enterCommand("""nnoremap <expr> n ':echo ' .. v:count .. "\<CR>"""")
     typeText("n")
     assertExOutput("0")
   }
@@ -23,15 +23,31 @@ class VimVariableServiceTest : VimTestCase() {
   @Test
   fun `test v count variable`() {
     configureByText("\n")
-    enterCommand("nnoremap <expr> n ':' .. \"\\<C-u>\" .. 'echo ' .. v:count .. \"\\<CR>\"")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count .. "\<CR>"""")
     typeText("5n")
     assertExOutput("5")
   }
 
+  @Test
+  fun `test v count variable with additional count during select register`() {
+    configureByText("\n")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count .. "\<CR>"""")
+    typeText("2\"a5n")
+    assertExOutput("10")
+  }
+
+  @Test
+  fun `test v count variable with additional pathological count during select register`() {
+    configureByText("\n")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count .. "\<CR>"""")
+    typeText("2\"a3\"b4\"c5n")
+    assertExOutput("120")
+  }
+
   @Test
   fun `test v count1 variable without count specified`() {
     configureByText("\n")
-    enterCommand("nnoremap <expr> n ':echo ' .. v:count1 .. \"\\<CR>\"")
+    enterCommand("""nnoremap <expr> n ':echo ' .. v:count1 .. "\<CR>"""")
     typeText("n")
     assertExOutput("1")
   }
@@ -39,11 +55,27 @@ class VimVariableServiceTest : VimTestCase() {
   @Test
   fun `test v count1 variable`() {
     configureByText("\n")
-    enterCommand("nnoremap <expr> n ':' .. \"\\<C-u>\" .. 'echo ' .. v:count1 .. \"\\<CR>\"")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count1 .. "\<CR>"""")
     typeText("5n")
     assertExOutput("5")
   }
 
+  @Test
+  fun `test v count1 variable with additional count during select register`() {
+    configureByText("\n")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count1 .. "\<CR>"""")
+    typeText("2\"a5n")
+    assertExOutput("10")
+  }
+
+  @Test
+  fun `test v count1 variable with additional pathological count during select register`() {
+    configureByText("\n")
+    enterCommand("""nnoremap <expr> n ':' .. "\<C-u>" .. 'echo ' .. v:count1 .. "\<CR>"""")
+    typeText("2\"a3\"b4\"c5n")
+    assertExOutput("120")
+  }
+
   @Test
   fun `test mapping with updating jumplist`() {
     configureByText("${c}1\n2\n3\n4\n5\n6\n7\n8\n9\n")

src/test/java/org/jetbrains/plugins/ideavim/extension/argtextobj/VimArgTextObjExtensionTest.kt

@@ -141,6 +141,16 @@ Mode.INSERT,
     )
   }
 
+  @Test
+  fun testDeleteWithMultipleCounts() {
+    doTest(
+      "2d2aa",
+      "function(int <caret>arg1,    char* arg<caret>2=\"a,b,c(d,e)\", bool arg3, string arg4, int arg5)",
+      "function(<caret>)",
+      Mode.NORMAL(),
+    )
+  }
+
   @Test
   fun testSelectTwoArguments() {
     doTest(

tests/property-tests/src/test/kotlin/org/jetbrains/plugins/ideavim/propertybased/RandomActionsPropertyTest.kt

@@ -95,7 +95,7 @@ private class AvailableActions(private val editor: Editor) : ImperativeCommand {
     val currentNode = KeyHandler.getInstance().keyHandlerState.commandBuilder.getCurrentTrie()
 
     // Note: esc is always an option
-    val possibleKeys = (currentNode.keys.toList() + esc).sortedBy { injector.parser.toKeyNotation(it) }
+    val possibleKeys = (currentNode.children.keys.toList() + esc).sortedBy { injector.parser.toKeyNotation(it) }
     println("Keys: ${possibleKeys.joinToString(", ")}")
     val keyGenerator = Generator.integers(0, possibleKeys.lastIndex)
       .suchThat { injector.parser.toKeyNotation(possibleKeys[it]) !in stinkyKeysList }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/KeyHandler.kt

@@ -17,14 +17,13 @@ import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.MappingMode
 import com.maddyhome.idea.vim.command.MappingProcessor
 import com.maddyhome.idea.vim.command.OperatorArguments
-import com.maddyhome.idea.vim.common.CurrentCommandState
 import com.maddyhome.idea.vim.diagnostic.VimLogger
 import com.maddyhome.idea.vim.diagnostic.trace
 import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.impl.state.toMappingMode
-import com.maddyhome.idea.vim.key.CommandPartNode
 import com.maddyhome.idea.vim.key.KeyConsumer
 import com.maddyhome.idea.vim.key.KeyStack
+import com.maddyhome.idea.vim.key.RootNode
 import com.maddyhome.idea.vim.key.consumers.CharArgumentConsumer
 import com.maddyhome.idea.vim.key.consumers.CommandConsumer
 import com.maddyhome.idea.vim.key.consumers.CommandCountConsumer
@@ -197,11 +196,9 @@ class KeyHandler {
   }
 
   private fun onUnknownKey(editor: VimEditor, keyState: KeyHandlerState) {
-    logger.trace("Command builder is set to BAD")
-    keyState.commandBuilder.commandState = CurrentCommandState.BAD_COMMAND
     editor.resetOpPending()
-    injector.vimState.resetRegisterPending()
     editor.isReplaceCharacter = false
+    // Note that this will also reset the CommandBuilder to NEW_COMMAND
     reset(keyState, editor.mode)
   }
 
@@ -210,14 +207,6 @@ class KeyHandler {
     injector.messages.indicateError()
   }
 
-  fun isDuplicateOperatorKeyStroke(key: KeyStroke, mode: Mode, keyState: KeyHandlerState): Boolean {
-    return isOperatorPending(mode, keyState) && keyState.commandBuilder.isDuplicateOperatorKeyStroke(key)
-  }
-
-  fun isOperatorPending(mode: Mode, keyState: KeyHandlerState): Boolean {
-    return mode is Mode.OP_PENDING && !keyState.commandBuilder.isEmpty
-  }
-
   private fun executeCommand(
     editor: VimEditor,
     context: ExecutionContext,
@@ -226,11 +215,7 @@ class KeyHandler {
   ) {
     logger.trace("Command execution")
     val command = keyState.commandBuilder.buildCommand()
-    val operatorArguments = OperatorArguments(
-      editor.mode is Mode.OP_PENDING,
-      command.rawCount,
-      editorState.mode,
-    )
+    val operatorArguments = OperatorArguments(command.rawCount, editorState.mode)
 
     // If we were in "operator pending" mode, reset back to normal mode.
     // But opening command line should not reset operator pending mode (e.g. `d/foo`
@@ -295,7 +280,7 @@ class KeyHandler {
     keyState.commandBuilder.resetAll(getKeyRoot(mode.toMappingMode()))
   }
 
-  private fun getKeyRoot(mappingMode: MappingMode): CommandPartNode<LazyVimCommand> {
+  private fun getKeyRoot(mappingMode: MappingMode): RootNode<LazyVimCommand> {
     return injector.keyGroup.getKeyRoot(mappingMode)
   }
 
@@ -341,7 +326,7 @@ class KeyHandler {
   ) : Runnable {
     override fun run() {
       val editorState = injector.vimState
-      keyState.commandBuilder.commandState = CurrentCommandState.NEW_COMMAND
+
       val register = cmd.register
       if (register != null) {
         injector.registerGroup.selectRegister(register)
@@ -361,22 +346,15 @@ class KeyHandler {
       // mode we were in. This handles commands in those modes that temporarily allow us to execute normal
       // mode commands. An exception is if this command should leave us in the temporary mode such as
       // "select register"
-      val myMode = editorState.mode
-      val returnTo = myMode.returnTo
-      if (myMode is Mode.NORMAL && returnTo != null && !cmd.flags.contains(CommandFlags.FLAG_EXPECT_MORE)) {
-        when (returnTo) {
-          ReturnTo.INSERT -> {
-            editor.mode = Mode.INSERT
+      if (editorState.mode is Mode.NORMAL && !cmd.flags.contains(CommandFlags.FLAG_EXPECT_MORE)) {
+        when (editorState.mode.returnTo) {
+          ReturnTo.INSERT -> editor.mode = Mode.INSERT
+          ReturnTo.REPLACE -> editor.mode = Mode.REPLACE
+          null -> {}
+        }
       }
 
-          ReturnTo.REPLACE -> {
-            editor.mode = Mode.REPLACE
-          }
-        }
-      }
-      if (keyState.commandBuilder.isDone()) {
-        getInstance().reset(keyState, editorState.mode)
-      }
+      instance.reset(keyState, editorState.mode)
     }
   }
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeCharacterAction.kt

@@ -17,23 +17,17 @@ import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.api.lineLength
 import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.Command
-import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.diagnostic.debug
 import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.handler.ChangeEditorActionHandler
-import com.maddyhome.idea.vim.helper.enumSetOf
 import com.maddyhome.idea.vim.state.KeyHandlerState
-import java.util.*
 
 @CommandOrMotion(keys = ["r"], modes = [Mode.NORMAL])
 class ChangeCharacterAction : ChangeEditorActionHandler.ForEachCaret() {
   override val type: Command.Type = Command.Type.CHANGE
-
   override val argumentType: Argument.Type = Argument.Type.DIGRAPH
 
-  override val flags: EnumSet<CommandFlags> = enumSetOf(CommandFlags.FLAG_ALLOW_DIGRAPH)
-
   override fun onStartWaitingForArgument(editor: VimEditor, context: ExecutionContext, keyState: KeyHandlerState) {
     editor.isReplaceCharacter = true
   }
@@ -45,7 +39,7 @@ class ChangeCharacterAction : ChangeEditorActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    return argument != null && changeCharacter(editor, caret, operatorArguments.count1, argument.character)
+    return argument is Argument.Character && changeCharacter(editor, caret, operatorArguments.count1, argument.character)
   }
 }
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeLineAction.kt

@@ -37,12 +37,11 @@ class ChangeLineAction : ChangeInInsertSequenceAction() {
   ): Boolean {
     // `S` command is a synonym of `cc`
     val motion = MotionDownLess1FirstNonSpaceAction()
-    val command = Command(1, motion, motion.type, motion.flags)
     return injector.changeGroup.changeMotion(
       editor,
       caret,
       context,
-      Argument(command),
+      Argument.Motion(motion, null),
       operatorArguments,
     )
   }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeReplaceAction.kt

@@ -15,6 +15,7 @@ import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.command.OperatorArguments
+import com.maddyhome.idea.vim.common.VimEditorReplaceMask
 import com.maddyhome.idea.vim.handler.ChangeEditorActionHandler
 
 @CommandOrMotion(keys = ["R"], modes = [Mode.NORMAL])
@@ -39,4 +40,5 @@ class ChangeReplaceAction : ChangeEditorActionHandler.SingleExecution() {
  */
 private fun changeReplace(editor: VimEditor, context: ExecutionContext) {
   injector.changeGroup.initInsert(editor, context, com.maddyhome.idea.vim.state.mode.Mode.REPLACE)
+  editor.replaceMask = VimEditorReplaceMask()
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeVisualAction.kt

@@ -39,7 +39,6 @@ class ChangeVisualAction : VisualOperatorActionHandler.ForEachCaret() {
       range.toVimTextRange(false),
       range.type,
       context,
-      operatorArguments,
     )
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeVisualCharacterAction.kt

@@ -15,16 +15,13 @@ import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.Command
-import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.TextRange
 import com.maddyhome.idea.vim.diagnostic.debug
 import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.group.visual.VimSelection
 import com.maddyhome.idea.vim.handler.VisualOperatorActionHandler
-import com.maddyhome.idea.vim.helper.enumSetOf
 import com.maddyhome.idea.vim.state.KeyHandlerState
-import java.util.*
 
 /**
  * @author vlan
@@ -32,11 +29,8 @@ import java.util.*
 @CommandOrMotion(keys = ["r"], modes = [Mode.VISUAL])
 class ChangeVisualCharacterAction : VisualOperatorActionHandler.ForEachCaret() {
   override val type: Command.Type = Command.Type.CHANGE
-
   override val argumentType: Argument.Type = Argument.Type.DIGRAPH
 
-  override val flags: EnumSet<CommandFlags> = enumSetOf(CommandFlags.FLAG_ALLOW_DIGRAPH)
-
   override fun onStartWaitingForArgument(editor: VimEditor, context: ExecutionContext, keyState: KeyHandlerState) {
     editor.isReplaceCharacter = true
   }
@@ -50,7 +44,7 @@ class ChangeVisualCharacterAction : VisualOperatorActionHandler.ForEachCaret() {
     operatorArguments: OperatorArguments,
   ): Boolean {
     val argument = cmd.argument
-    return argument != null &&
+    return argument is Argument.Character &&
       changeCharacterRange(editor, caret, range.toVimTextRange(false), argument.character)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeVisualLinesAction.kt

@@ -56,7 +56,6 @@ class ChangeVisualLinesAction : VisualOperatorActionHandler.ForEachCaret() {
       lineRange,
       SelectionType.LINE_WISE,
       context,
-      operatorArguments,
     )
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/ChangeVisualLinesEndAction.kt

@@ -53,7 +53,7 @@ class ChangeVisualLinesEndAction : VisualOperatorActionHandler.ForEachCaret() {
         }
       }
       val blockRange = TextRange(starts, ends)
-      injector.changeGroup.changeRange(editor, caret, blockRange, SelectionType.BLOCK_WISE, context, operatorArguments)
+      injector.changeGroup.changeRange(editor, caret, blockRange, SelectionType.BLOCK_WISE, context)
     } else {
       val lineEndForOffset = editor.getLineEndForOffset(vimTextRange.endOffset)
       val endsWithNewLine = if (lineEndForOffset.toLong() == editor.fileSize()) 0 else 1
@@ -61,7 +61,7 @@ class ChangeVisualLinesEndAction : VisualOperatorActionHandler.ForEachCaret() {
         editor.getLineStartForOffset(vimTextRange.startOffset),
         lineEndForOffset + endsWithNewLine,
       )
-      injector.changeGroup.changeRange(editor, caret, lineRange, SelectionType.LINE_WISE, context, operatorArguments)
+      injector.changeGroup.changeRange(editor, caret, lineRange, SelectionType.LINE_WISE, context)
     }
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/change/FilterMotionAction.kt

@@ -31,7 +31,7 @@ class FilterVisualLinesAction : VimActionHandler.SingleExecution(), FilterComman
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     // Start ex entry with the initial text set to the calculated range and `!`
-    startFilterCommand(editor, context, cmd)
+    startFilterCommand(editor, context, cmd.rawCount)
     return true
   }
 }
@@ -63,13 +63,13 @@ class FilterMotionAction : VimActionHandler.SingleExecution(), FilterCommand, Du
 
     // Start ex entry with the initial text set to the calculated range and `!`
     val count = if (start.line < end.line) end.line - start.line + 1 else 1
-    startFilterCommand(editor, context, Argument.EMPTY_COMMAND.copy(rawCount = count))
+    startFilterCommand(editor, context, count)
     return true
   }
 }
 
 interface FilterCommand {
-  fun startFilterCommand(editor: VimEditor, context: ExecutionContext, cmd: Command) {
-    injector.commandLine.createCommandPrompt(editor, context, cmd, initialText = "!")
+  fun startFilterCommand(editor: VimEditor, context: ExecutionContext, count0: Int) {
+    injector.commandLine.createCommandPrompt(editor, context, count0, initialText = "!")
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/delete/DeleteMotionAction.kt

@@ -38,6 +38,6 @@ class DeleteMotionAction : ChangeEditorActionHandler.ForEachCaret(), DuplicableO
     val (range, selectionType) = injector.changeGroup
       .getDeleteRangeAndType(editor, caret, context, argument, false, operatorArguments)
       ?: return false
-    return injector.changeGroup.deleteRange(editor, caret, range, selectionType, false, operatorArguments)
+    return injector.changeGroup.deleteRange(editor, caret, range, selectionType, false)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/delete/DeleteVisualAction.kt

@@ -40,7 +40,6 @@ class DeleteVisualAction : VisualOperatorActionHandler.ForEachCaret() {
       range.toVimTextRange(false),
       selectionType,
       false,
-      operatorArguments,
     )
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/delete/DeleteVisualLinesAction.kt

@@ -56,6 +56,6 @@ class DeleteVisualLinesAction : VisualOperatorActionHandler.ForEachCaret() {
         Triple(caret, lineRange, SelectionType.LINE_WISE)
       }
     }
-    return injector.changeGroup.deleteRange(editor, usedCaret, usedRange, usedType, false, operatorArguments)
+    return injector.changeGroup.deleteRange(editor, usedCaret, usedRange, usedType, false)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/delete/DeleteVisualLinesEndAction.kt

@@ -58,7 +58,6 @@ class DeleteVisualLinesEndAction : VisualOperatorActionHandler.ForEachCaret() {
         blockRange,
         SelectionType.BLOCK_WISE,
         false,
-        operatorArguments,
       )
     } else {
       val lineEndForOffset = editor.getLineEndForOffset(vimTextRange.endOffset)
@@ -67,7 +66,7 @@ class DeleteVisualLinesEndAction : VisualOperatorActionHandler.ForEachCaret() {
         editor.getLineStartForOffset(vimTextRange.startOffset),
         lineEndForOffset + endsWithNewLine,
       )
-      injector.changeGroup.deleteRange(editor, caret, lineRange, SelectionType.LINE_WISE, false, operatorArguments)
+      injector.changeGroup.deleteRange(editor, caret, lineRange, SelectionType.LINE_WISE, false)
     }
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertBackspaceAction.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2003-2024 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package com.maddyhome.idea.vim.action.change.insert
+
+import com.intellij.vim.annotations.CommandOrMotion
+import com.intellij.vim.annotations.Mode
+import com.maddyhome.idea.vim.api.ExecutionContext
+import com.maddyhome.idea.vim.api.VimEditor
+import com.maddyhome.idea.vim.api.getLineStartForOffset
+import com.maddyhome.idea.vim.api.injector
+import com.maddyhome.idea.vim.command.Command
+import com.maddyhome.idea.vim.command.OperatorArguments
+import com.maddyhome.idea.vim.handler.VimActionHandler
+
+@CommandOrMotion(keys = ["<C-H>", "<BS>"], modes = [Mode.INSERT])
+internal class InsertBackspaceAction : VimActionHandler.SingleExecution() {
+  override val type: Command.Type = Command.Type.OTHER_WRITABLE
+
+  override fun execute( editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments, ): Boolean {
+    if (editor.insertMode) {
+      injector.changeGroup.processBackspace(editor, context)
+    } else {
+      for (caret in editor.carets()) {
+        val offset = (caret.offset - 1).takeIf { it > 0 } ?: continue
+        val oldChar = editor.replaceMask?.popChange(editor, offset)
+        if (oldChar != null) {
+          injector.changeGroup.replaceText(editor, caret, offset, offset + 1, oldChar.toString())
+        }
+        caret.moveToOffset(offset)
+      }
+    }
+    return true
+  }
+}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertCompletedDigraphAction.kt

@@ -52,7 +52,8 @@ class InsertCompletedDigraphAction : VimActionHandler.SingleExecution() {
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     // The converted digraph character has been captured as an argument, push it back through key handler
-    val keyStroke = KeyStroke.getKeyStroke(cmd.argument!!.character)
+    val argument = cmd.argument as? Argument.Character ?: return false
+    val keyStroke = KeyStroke.getKeyStroke(argument.character)
     val keyHandler = KeyHandler.getInstance()
     keyHandler.handleKey(editor, keyStroke, context, keyHandler.keyHandlerState)
     return true

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertCompletedLiteralAction.kt

@@ -52,7 +52,8 @@ class InsertCompletedLiteralAction : VimActionHandler.SingleExecution() {
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     // The converted literal character has been captured as an argument, push it back through key handler
-    val keyStroke = KeyStroke.getKeyStroke(cmd.argument!!.character)
+    val argument = cmd.argument as? Argument.Character ?: return false
+    val keyStroke = KeyStroke.getKeyStroke(argument.character)
     val keyHandler = KeyHandler.getInstance()
     keyHandler.handleKey(editor, keyStroke, context, keyHandler.keyHandlerState)
     return true

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertDeleteInsertedTextAction.kt

@@ -36,7 +36,7 @@ class InsertDeleteInsertedTextAction : ChangeEditorActionHandler.ForEachCaret()
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    return insertDeleteInsertedText(editor, caret, operatorArguments)
+    return insertDeleteInsertedText(editor, caret)
   }
 }
 
@@ -48,11 +48,7 @@ class InsertDeleteInsertedTextAction : ChangeEditorActionHandler.ForEachCaret()
  * @param caret  The caret on which the action is performed
  * @return true if able to delete the text, false if not
  */
-private fun insertDeleteInsertedText(
-  editor: VimEditor,
-  caret: VimCaret,
-  operatorArguments: OperatorArguments,
-): Boolean {
+private fun insertDeleteInsertedText(editor: VimEditor, caret: VimCaret): Boolean {
   var deleteTo = caret.vimInsertStart.startOffset
   val offset = caret.offset
   if (offset == deleteTo) {
@@ -65,7 +61,6 @@ private fun insertDeleteInsertedText(
       TextRange(deleteTo, offset),
       SelectionType.CHARACTER_WISE,
       false,
-      operatorArguments,
     )
     return true
   }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertDeletePreviousWordAction.kt

@@ -37,7 +37,7 @@ class InsertDeletePreviousWordAction : ChangeEditorActionHandler.ForEachCaret()
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    return insertDeletePreviousWord(editor, caret, operatorArguments)
+    return insertDeletePreviousWord(editor, caret)
   }
 }
 
@@ -50,7 +50,7 @@ class InsertDeletePreviousWordAction : ChangeEditorActionHandler.ForEachCaret()
  * @param editor The editor to delete the text from
  * @return true if able to delete text, false if not
  */
-private fun insertDeletePreviousWord(editor: VimEditor, caret: VimCaret, operatorArguments: OperatorArguments): Boolean {
+private fun insertDeletePreviousWord(editor: VimEditor, caret: VimCaret): Boolean {
   val deleteTo: Int = if (caret.getBufferPosition().column == 0) {
     caret.offset - 1
   } else {
@@ -74,6 +74,6 @@ private fun insertDeletePreviousWord(editor: VimEditor, caret: VimCaret, operato
     return false
   }
   val range = TextRange(deleteTo, caret.offset)
-  injector.changeGroup.deleteRange(editor, caret, range, SelectionType.CHARACTER_WISE, true, operatorArguments)
+  injector.changeGroup.deleteRange(editor, caret, range, SelectionType.CHARACTER_WISE, true)
   return true
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/InsertRegisterAction.kt

@@ -18,14 +18,10 @@ import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.ex.ExException
 import com.maddyhome.idea.vim.handler.VimActionHandler
 import com.maddyhome.idea.vim.helper.RWLockLabel
-import com.maddyhome.idea.vim.helper.isCloseKeyStroke
-import com.maddyhome.idea.vim.key.interceptors.VimInputInterceptorBase
 import com.maddyhome.idea.vim.put.PutData
 import com.maddyhome.idea.vim.register.Register
 import com.maddyhome.idea.vim.state.mode.SelectionType
 import com.maddyhome.idea.vim.vimscript.model.Script
-import java.awt.event.KeyEvent
-import javax.swing.KeyStroke
 
 @CommandOrMotion(keys = ["<C-R>"], modes = [Mode.INSERT])
 class InsertRegisterAction : VimActionHandler.SingleExecution() {
@@ -39,9 +35,8 @@ class InsertRegisterAction : VimActionHandler.SingleExecution() {
     cmd: Command,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    val argument = cmd.argument
-
-    if (argument?.character == '=') {
+    val argument = cmd.argument as? Argument.Character ?: return false
+    if (argument.character == '=') {
       injector.commandLine.readInputAndProcess(editor, context, "=", finishOn = null) { input ->
         try {
           if (input.isNotEmpty()) {
@@ -50,7 +45,7 @@ class InsertRegisterAction : VimActionHandler.SingleExecution() {
             val textToStore = expression.toInsertableString()
             injector.registerGroup.storeTextSpecial('=', textToStore)
           }
-          insertRegister(editor, context, '=', operatorArguments)
+          insertRegister(editor, context, '=')
         } catch (e: ExException) {
           injector.messages.indicateError()
           injector.messages.showStatusBarMessage(editor, e.message)
@@ -58,7 +53,7 @@ class InsertRegisterAction : VimActionHandler.SingleExecution() {
       }
       return true
     } else {
-      return argument != null && insertRegister(editor, context, argument.character, operatorArguments)
+      return insertRegister(editor, context, argument.character)
     }
   }
 }
@@ -72,18 +67,13 @@ class InsertRegisterAction : VimActionHandler.SingleExecution() {
  * @return true if able to insert the register contents, false if not
  */
 @RWLockLabel.SelfSynchronized
-private fun insertRegister(
-  editor: VimEditor,
-  context: ExecutionContext,
-  key: Char,
-  operatorArguments: OperatorArguments,
-): Boolean {
+private fun insertRegister(editor: VimEditor, context: ExecutionContext, key: Char): Boolean {
   val register: Register? = injector.registerGroup.getRegister(key)
   if (register != null) {
     val text = register.rawText ?: injector.parser.toPrintableString(register.keys)
     val textData = PutData.TextData(text, SelectionType.CHARACTER_WISE, emptyList(), register.name)
     val putData = PutData(textData, null, 1, insertTextBeforeCaret = true, rawIndent = true, caretAfterInsertedText = true)
-    injector.put.putText(editor, context, putData, operatorArguments = operatorArguments)
+    injector.put.putText(editor, context, putData)
     return true
   }
   return false

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/VisualBlockAppendAction.kt

@@ -36,7 +36,7 @@ class VisualBlockAppendAction : VisualOperatorActionHandler.SingleExecution() {
     if (editor.isOneLineMode()) return false
     val range = caretsAndSelections.values.stream().findFirst().orElse(null) ?: return false
     return if (range.type == SelectionType.BLOCK_WISE) {
-      injector.changeGroup.blockInsert(editor, context, range.toVimTextRange(false), true, operatorArguments)
+      injector.changeGroup.initBlockInsert(editor, context, range.toVimTextRange(false), true)
     } else {
       injector.changeGroup.insertAfterLineEnd(editor, context)
       true

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/change/insert/VisualBlockInsertAction.kt

@@ -36,7 +36,7 @@ class VisualBlockInsertAction : VisualOperatorActionHandler.SingleExecution() {
     if (editor.isOneLineMode()) return false
     val vimSelection = caretsAndSelections.values.stream().findFirst().orElse(null) ?: return false
     return if (vimSelection.type == SelectionType.BLOCK_WISE) {
-      injector.changeGroup.blockInsert(editor, context, vimSelection.toVimTextRange(false), false, operatorArguments)
+      injector.changeGroup.initBlockInsert(editor, context, vimSelection.toVimTextRange(false), false)
     } else {
       injector.changeGroup.insertBeforeFirstNonBlank(editor, context)
       true

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/copy/PutTextAction.kt

@@ -52,7 +52,7 @@ sealed class PutTextBaseAction(
       }
       result
     } else {
-      injector.put.putText(editor, context, getPutData(count), operatorArguments)
+      injector.put.putText(editor, context, getPutData(count))
     }
   }
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/ex/ExEntryAction.kt

@@ -26,7 +26,7 @@ class ExEntryAction : VimActionHandler.SingleExecution() {
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     if (editor.isOneLineMode()) return false
-    injector.commandLine.createCommandPrompt(editor, context, cmd, initialText = "")
+    injector.commandLine.createCommandPrompt(editor, context, cmd.rawCount, initialText = "")
     return true
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/ex/InsertRegisterAction.kt

@@ -38,7 +38,8 @@ class InsertRegisterAction: VimActionHandler.SingleExecution() {
 
     val caretOffset = cmdLine.caret.offset
 
-    val keyStroke = KeyStroke.getKeyStroke(cmd.argument!!.character)
+    val argument = cmd.argument as? Argument.Character ?: return false
+    val keyStroke = KeyStroke.getKeyStroke(argument.character)
     val pasteContent = if ((keyStroke.modifiers and KeyEvent.CTRL_DOWN_MASK) == 0)  {
       injector.registerGroup.getRegister(keyStroke.keyChar)?.text
     } else {

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/ex/LeaveCommandLineAction.kt

@@ -13,6 +13,7 @@ import com.intellij.vim.annotations.Mode
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
+import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.OperatorArguments
@@ -27,8 +28,8 @@ class LeaveCommandLineAction : VimActionHandler.SingleExecution() {
   override val type: Command.Type = Command.Type.OTHER_READONLY
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
-    val argument = cmd.argument ?: return true
-    val historyType = VimHistory.Type.getTypeByLabel(argument.character.toString())
+    val argument = cmd.argument as? Argument.ExString ?: return true
+    val historyType = VimHistory.Type.getTypeByLabel(argument.label.toString())
     injector.historyGroup.addEntry(historyType, argument.string)
     return true
   }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/ex/ProcessExEntryActions.kt

@@ -34,8 +34,9 @@ class ProcessExEntryAction : MotionActionHandler.AmbiguousExecution()  {
   override var motionType: MotionType = MotionType.EXCLUSIVE
 
   override fun getMotionActionHandler(argument: Argument?): MotionActionHandler {
-    if (argument?.processing != null) return ExecuteDefinedInputProcessingAction()
-    return if (argument?.character == ':') ProcessExCommandEntryAction() else ProcessSearchEntryAction(this)
+    check(argument is Argument.ExString)
+    if (argument.processing != null) return ExecuteDefinedInputProcessingAction()
+    return if (argument.label == ':') ProcessExCommandEntryAction() else ProcessSearchEntryAction(this)
   }
 }
 
@@ -48,7 +49,7 @@ class ExecuteDefinedInputProcessingAction : MotionActionHandler.SingleExecution(
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.ExString) return Motion.Error
     val input = argument.string
     val processing = argument.processing!!
 
@@ -62,11 +63,11 @@ class ProcessSearchEntryAction(private val parentAction: ProcessExEntryAction) :
     get() = throw RuntimeException("Parent motion type should be used, as only it is accessed by other code")
 
   override fun getOffset(editor: VimEditor, caret: ImmutableVimCaret, context: ExecutionContext, argument: Argument?, operatorArguments: OperatorArguments): Motion {
-    if (argument == null) return Motion.Error
-    val offsetAndMotion = when (argument.character) {
+    if (argument !is Argument.ExString) return Motion.Error
+    val offsetAndMotion = when (argument.label) {
       '/' -> injector.searchGroup.processSearchCommand(editor, argument.string, caret.offset, operatorArguments.count1, Direction.FORWARDS)
       '?' -> injector.searchGroup.processSearchCommand(editor, argument.string, caret.offset, operatorArguments.count1, Direction.BACKWARDS)
-      else -> throw ExException("Unexpected search label ${argument.character}")
+      else -> throw ExException("Unexpected search label ${argument.label}")
     }
     if (offsetAndMotion == null) return Motion.Error
     parentAction.motionType = offsetAndMotion.second
@@ -78,7 +79,7 @@ class ProcessExCommandEntryAction : MotionActionHandler.SingleExecution() {
   override val motionType: MotionType = MotionType.LINE_WISE
 
   override fun getOffset(editor: VimEditor, context: ExecutionContext, argument: Argument?, operatorArguments: OperatorArguments): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.ExString) return Motion.Error
 
     try {
       // Exit Command-line mode and return to the previous mode before executing the command (this is set to Normal in

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/macro/PlaybackRegisterAction.kt

@@ -31,7 +31,7 @@ class PlaybackRegisterAction : VimActionHandler.SingleExecution() {
     cmd: Command,
     operatorArguments: OperatorArguments,
   ): Boolean {
-    val argument = cmd.argument ?: return false
+    val argument = cmd.argument as? Argument.Character ?: return false
     val reg = argument.character
     val application = injector.application
     val res = arrayOf(false)
@@ -49,7 +49,7 @@ class PlaybackRegisterAction : VimActionHandler.SingleExecution() {
           if (reg != '@') { // @ is not a register itself, it just tells vim to use the last register
             injector.macro.lastRegister = reg
           }
-        } catch (e: ExException) {
+        } catch (_: ExException) {
           res[0] = false
         }
       }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/macro/ToggleRecordingAction.kt

@@ -26,7 +26,7 @@ class ToggleRecordingAction : VimActionHandler.SingleExecution() {
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
     return if (!injector.registerGroup.isRecording) {
-      val argument = cmd.argument ?: return false
+      val argument = cmd.argument as? Argument.Character ?: return false
       val reg = argument.character
       injector.registerGroup.startRecording(reg)
     } else {

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionArrowLeftAction.kt

@@ -19,10 +19,21 @@ import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.handler.Motion
+import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.handler.NonShiftedSpecialKeyHandler
 
-@CommandOrMotion(keys = ["<Left>", "<kLeft>"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionArrowLeftAction : NonShiftedSpecialKeyHandler() {
+private fun doMotion(
+  editor: VimEditor,
+  caret: ImmutableVimCaret,
+  count1: Int,
+  whichwrapKey: String,
+  allowPastEnd: Boolean,
+): Motion {
+  val allowWrap = injector.options(editor).whichwrap.contains(whichwrapKey)
+  return injector.motion.getHorizontalMotion(editor, caret, count1, allowPastEnd, allowWrap)
+}
+
+abstract class MotionNonShiftedArrowLeftBaseAction() : NonShiftedSpecialKeyHandler() {
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
   override fun motion(
@@ -32,8 +43,38 @@ class MotionArrowLeftAction : NonShiftedSpecialKeyHandler() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    val allowWrap = injector.options(editor).whichwrap.contains("<")
-    val allowEnd = operatorArguments.isOperatorPending // d<Left> deletes \n with wrap enabled
-    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, allowEnd, allowWrap)
+    return doMotion(editor, caret, -operatorArguments.count1, "<", allowPastEnd)
+  }
+
+  protected open val allowPastEnd: Boolean = false
+}
+
+// Note that Select mode is handled in [SelectMotionArrowLeftAction]
+@CommandOrMotion(keys = ["<Left>", "<kLeft>"], modes = [Mode.NORMAL, Mode.VISUAL])
+class MotionArrowLeftAction : MotionNonShiftedArrowLeftBaseAction()
+
+@CommandOrMotion(keys = ["<Left>", "<kLeft>"], modes = [Mode.OP_PENDING])
+class MotionArrowLeftOpPendingAction : MotionNonShiftedArrowLeftBaseAction() {
+  // When the motion is used with an operator, the EOL character is counted.
+  // This allows e.g., `d<Left>` to delete the end of line character on the previous line when wrap is active
+  // ('whichwrap' contains "<")
+  // See `:help whichwrap`. This says a delete or change operator, but it appears to apply to all operators
+  override val allowPastEnd = true
+}
+
+// Just needs to be a plain motion handler - it's not shifted, and the non-shifted actions don't apply in Insert mode
+@CommandOrMotion(keys = ["<Left>", "<kLeft>"], modes = [Mode.INSERT])
+class MotionArrowLeftInsertModeAction : MotionActionHandler.ForEachCaret() {
+  override val motionType: MotionType = MotionType.EXCLUSIVE
+
+  override fun getOffset(
+    editor: VimEditor,
+    caret: ImmutableVimCaret,
+    context: ExecutionContext,
+    argument: Argument?,
+    operatorArguments: OperatorArguments,
+  ): Motion {
+    // Insert mode is always allowed past the end of the line
+    return doMotion(editor, caret, -operatorArguments.count1, "[", allowPastEnd = true)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionArrowRightAction.kt

@@ -19,12 +19,23 @@ import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.handler.Motion
+import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.handler.NonShiftedSpecialKeyHandler
 import com.maddyhome.idea.vim.helper.isEndAllowed
 import com.maddyhome.idea.vim.helper.usesVirtualSpace
 
-@CommandOrMotion(keys = ["<Right>", "<kRight>"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionArrowRightAction : NonShiftedSpecialKeyHandler() {
+private fun doMotion(
+  editor: VimEditor,
+  caret: ImmutableVimCaret,
+  count1: Int,
+  whichwrapKey: String,
+  allowPastEnd: Boolean,
+): Motion {
+  val allowWrap = injector.options(editor).whichwrap.contains(whichwrapKey)
+  return injector.motion.getHorizontalMotion(editor, caret, count1, allowPastEnd, allowWrap)
+}
+
+abstract class MotionNonShiftedArrowRightBaseAction() : NonShiftedSpecialKeyHandler() {
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
   override fun motion(
@@ -34,9 +45,38 @@ class MotionArrowRightAction : NonShiftedSpecialKeyHandler() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    val allowPastEnd = editor.usesVirtualSpace || editor.isEndAllowed ||
-      operatorArguments.isOperatorPending // because of `d<Right>` removing the last character
-    val allowWrap = injector.options(editor).whichwrap.contains(">")
-    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd, allowWrap)
+    return doMotion(editor, caret, operatorArguments.count1, ">", allowPastEnd(editor))
+  }
+
+  protected open fun allowPastEnd(editor: VimEditor) = editor.usesVirtualSpace || editor.isEndAllowed
+}
+
+// Note that Select mode is handled with [SelectMotionArrowRightAction]
+@CommandOrMotion(keys = ["<Right>", "<kRight>"], modes = [Mode.NORMAL, Mode.VISUAL])
+class MotionArrowRightAction : MotionNonShiftedArrowRightBaseAction()
+
+@CommandOrMotion(keys = ["<Right>", "<kRight>"], modes = [Mode.OP_PENDING])
+class MotionArrowRightOpPendingAction : MotionNonShiftedArrowRightBaseAction() {
+  // When the motion is used with an operator, the EOL character is counted.
+  // This allows e.g., `d<Right>` to delete the last character in a line. Note that we can't use editor.isEndAllowed to
+  // give us this because the current mode when we execute the operator/motion is no longer OP_PENDING.
+  // See `:help whichwrap`. This says a delete or change operator, but it appears to apply to all operators
+  override fun allowPastEnd(editor: VimEditor) = true
+}
+
+// Just needs to be a plain motion handler - it's not shifted, and the non-shifted actions don't apply in Insert mode
+@CommandOrMotion(keys = ["<Right>", "<kRight>"], modes = [Mode.INSERT])
+class MotionArrowRightInsertModeAction : MotionActionHandler.ForEachCaret() {
+  override val motionType: MotionType = MotionType.EXCLUSIVE
+
+  override fun getOffset(
+    editor: VimEditor,
+    caret: ImmutableVimCaret,
+    context: ExecutionContext,
+    argument: Argument?,
+    operatorArguments: OperatorArguments,
+  ): Motion {
+    // Insert mode is always allowed past the end of the line
+    return doMotion(editor, caret, operatorArguments.count1, "]", allowPastEnd = true)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionBackspaceAction.kt

@@ -20,8 +20,8 @@ import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.MotionActionHandler
 
-@CommandOrMotion(keys = ["<BS>", "<C-H>"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionBackspaceAction : MotionActionHandler.ForEachCaret() {
+@CommandOrMotion(keys = ["<BS>", "<C-H>"], modes = [Mode.NORMAL, Mode.VISUAL])
+open class MotionBackspaceAction(private val allowPastEnd: Boolean = false) : MotionActionHandler.ForEachCaret() {
   override fun getOffset(
     editor: VimEditor,
     caret: ImmutableVimCaret,
@@ -30,24 +30,15 @@ class MotionBackspaceAction : MotionActionHandler.ForEachCaret() {
     operatorArguments: OperatorArguments,
   ): Motion {
     val allowWrap = injector.options(editor).whichwrap.contains("b")
-    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, allowPastEnd = false, allowWrap)
+    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, allowPastEnd, allowWrap)
   }
 
   override val motionType: MotionType = MotionType.EXCLUSIVE
 }
 
-@CommandOrMotion(keys = ["<Space>"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionSpaceAction : MotionActionHandler.ForEachCaret() {
-  override fun getOffset(
-    editor: VimEditor,
-    caret: ImmutableVimCaret,
-    context: ExecutionContext,
-    argument: Argument?,
-    operatorArguments: OperatorArguments,
-  ): Motion {
-    val allowWrap = injector.options(editor).whichwrap.contains("s")
-    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd = false, allowWrap)
-  }
-
-  override val motionType: MotionType = MotionType.EXCLUSIVE
-}
+// When the motion is used with an operator, the EOL character is counted.
+// This allows e.g., `d<BS>` to delete the end of line character on the previous line when wrap is active
+// ('whichwrap' contains "b")
+// See `:help whichwrap`. This says a delete or change operator, but it appears to apply to all operators
+@CommandOrMotion(keys = ["<BS>", "<C-H>"], modes = [Mode.OP_PENDING])
+class MotionBackspaceOpPendingModeAction : MotionBackspaceAction(allowPastEnd = true)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionLastColumnAction.kt

@@ -27,13 +27,9 @@ import com.maddyhome.idea.vim.state.mode.inVisualMode
 import com.maddyhome.idea.vim.helper.isEndAllowed
 import java.util.*
 
-@CommandOrMotion(keys = ["<End>"], modes = [Mode.INSERT])
-class MotionLastColumnInsertAction : MotionLastColumnAction() {
-  override val flags: EnumSet<CommandFlags> = enumSetOf(CommandFlags.FLAG_SAVE_STROKE)
-}
+abstract class MotionLastColumnBaseAction(private val isMotionForOperator: Boolean = false)
+  : MotionActionHandler.ForEachCaret() {
 
-@CommandOrMotion(keys = ["$"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-open class MotionLastColumnAction : MotionActionHandler.ForEachCaret() {
   override val motionType: MotionType = MotionType.INCLUSIVE
 
   override fun getOffset(
@@ -43,13 +39,26 @@ open class MotionLastColumnAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    val allow = if (editor.inVisualMode) {
+    val allowPastEnd = if (editor.inVisualMode) {
       injector.options(editor).selection != "old"
     } else {
-      if (operatorArguments.isOperatorPending) false else editor.isEndAllowed
+      // Don't allow past end if this motion is for an operator. I.e., for something like `d$`, we don't want to delete
+      // the end of line character
+      if (isMotionForOperator) false else editor.isEndAllowed
     }
 
-    val offset = injector.motion.moveCaretToRelativeLineEnd(editor, caret, operatorArguments.count1 - 1, allow)
+    val offset = injector.motion.moveCaretToRelativeLineEnd(editor, caret, operatorArguments.count1 - 1, allowPastEnd)
     return Motion.AdjustedOffset(offset, VimMotionGroupBase.LAST_COLUMN)
   }
 }
+
+@CommandOrMotion(keys = ["$"], modes = [Mode.NORMAL, Mode.VISUAL])
+open class MotionLastColumnAction : MotionLastColumnBaseAction()
+
+@CommandOrMotion(keys = ["$"], modes = [Mode.OP_PENDING])
+class MotionLastColumnOpPendingAction : MotionLastColumnBaseAction(isMotionForOperator = true)
+
+@CommandOrMotion(keys = ["<End>"], modes = [Mode.INSERT])
+class MotionLastColumnInsertAction : MotionLastColumnAction() {
+  override val flags: EnumSet<CommandFlags> = enumSetOf(CommandFlags.FLAG_SAVE_STROKE)
+}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionLeftAction.kt

@@ -21,8 +21,7 @@ import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.MotionActionHandler
 
-@CommandOrMotion(keys = ["h"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionLeftAction : MotionActionHandler.ForEachCaret() {
+abstract class MotionLeftBaseAction(private val allowPastEnd: Boolean) : MotionActionHandler.ForEachCaret() {
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
   override fun getOffset(
@@ -33,23 +32,16 @@ class MotionLeftAction : MotionActionHandler.ForEachCaret() {
     operatorArguments: OperatorArguments,
   ): Motion {
     val allowWrap = injector.options(editor).whichwrap.contains("h")
-    val allowEnd = operatorArguments.isOperatorPending // dh deletes \n with wrap enabled
-    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, allowEnd, allowWrap)
+    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, allowPastEnd, allowWrap)
   }
 }
 
-@CommandOrMotion(keys = ["<Left>", "<kLeft>"], modes = [Mode.INSERT])
-class MotionLeftInsertModeAction : MotionActionHandler.ForEachCaret() {
-  override val motionType: MotionType = MotionType.EXCLUSIVE
+@CommandOrMotion(keys = ["h"], modes = [Mode.NORMAL, Mode.VISUAL])
+class MotionLeftAction : MotionLeftBaseAction(allowPastEnd = false)
 
-  override fun getOffset(
-    editor: VimEditor,
-    caret: ImmutableVimCaret,
-    context: ExecutionContext,
-    argument: Argument?,
-    operatorArguments: OperatorArguments,
-  ): Motion {
-    val allowWrap = injector.options(editor).whichwrap.contains("[")
-    return injector.motion.getHorizontalMotion(editor, caret, -operatorArguments.count1, true, allowWrap)
-  }
-}
+// When the motion is used with an operator, the EOL character is counted.
+// This allows e.g., `dh` to delete the end of line character on the previous line when wrap is active
+// ('whichwrap' contains "h")
+// See `:help whichwrap`. This says a delete or change operator, but it appears to apply to all operators
+@CommandOrMotion(keys = ["h"], modes = [Mode.OP_PENDING])
+class MotionLeftOpPendingModeAction : MotionLeftBaseAction(allowPastEnd = true)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionRightAction.kt

@@ -23,8 +23,7 @@ import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.helper.isEndAllowed
 import com.maddyhome.idea.vim.helper.usesVirtualSpace
 
-@CommandOrMotion(keys = ["l"], modes = [Mode.NORMAL, Mode.VISUAL, Mode.OP_PENDING])
-class MotionRightAction : MotionActionHandler.ForEachCaret() {
+abstract class MotionRightBaseAction() : MotionActionHandler.ForEachCaret() {
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
   override fun getOffset(
@@ -35,24 +34,20 @@ class MotionRightAction : MotionActionHandler.ForEachCaret() {
     operatorArguments: OperatorArguments,
   ): Motion {
     val allowWrap = injector.options(editor).whichwrap.contains("l")
-    val allowEnd = editor.usesVirtualSpace || editor.isEndAllowed ||
-      operatorArguments.isOperatorPending // because of `dl` removing the last character
-    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd = allowEnd, allowWrap)
-  }
+    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd(editor), allowWrap)
   }
 
-@CommandOrMotion(keys = ["<Right>", "<kRight>"], modes = [Mode.INSERT])
-class MotionRightInsertAction : MotionActionHandler.ForEachCaret() {
-  override val motionType: MotionType = MotionType.EXCLUSIVE
+  protected open fun allowPastEnd(editor: VimEditor)  = editor.usesVirtualSpace || editor.isEndAllowed
+}
 
-  override fun getOffset(
-    editor: VimEditor,
-    caret: ImmutableVimCaret,
-    context: ExecutionContext,
-    argument: Argument?,
-    operatorArguments: OperatorArguments,
-  ): Motion {
-    val allowWrap = injector.options(editor).whichwrap.contains("]")
-    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd = true, allowWrap)
-  }
+@CommandOrMotion(keys = ["l"], modes = [Mode.NORMAL, Mode.VISUAL])
+class MotionRightAction : MotionRightBaseAction()
+
+@CommandOrMotion(keys = ["l"], modes = [Mode.OP_PENDING])
+class MotionRightOpPendingAction : MotionRightBaseAction() {
+  // When the motion is used with an operator, the EOL character is counted.
+  // This allows e.g., `dl` to delete the last character in a line. Note that we can't use editor.isEndAllowed to give
+  // us this because the current mode when we execute the operator/motion is no longer OP_PENDING.
+  // See `:help whichwrap`. This says a delete or change operator, but it appears to apply to all operators
+  override fun allowPastEnd(editor: VimEditor) = true
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionShiftArrowLeftAction.kt

@@ -18,23 +18,19 @@ import com.maddyhome.idea.vim.api.moveToMotion
 import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.handler.ShiftedArrowKeyHandler
 
-/**
- * @author Alex Plate
- */
-
 @CommandOrMotion(keys = ["<S-Left>"], modes = [Mode.INSERT, Mode.NORMAL, Mode.VISUAL, Mode.SELECT])
-class MotionShiftLeftAction : ShiftedArrowKeyHandler(true) {
+class MotionShiftArrowLeftAction : ShiftedArrowKeyHandler(true) {
 
   override val type: Command.Type = Command.Type.OTHER_READONLY
 
   override fun motionWithKeyModel(editor: VimEditor, caret: VimCaret, context: ExecutionContext, cmd: Command) {
-    val vertical = injector.motion.getHorizontalMotion(editor, caret, -cmd.count, true)
-    caret.moveToMotion(vertical)
+    val motion = injector.motion.getHorizontalMotion(editor, caret, -cmd.count, true)
+    caret.moveToMotion(motion)
   }
 
   override fun motionWithoutKeyModel(editor: VimEditor, context: ExecutionContext, cmd: Command) {
     val caret = editor.currentCaret()
-    val newOffset = injector.motion.findOffsetOfNextWord(editor, caret.offset, -cmd.count, false)
-    caret.moveToMotion(newOffset)
+    val motion = injector.motion.findOffsetOfNextWord(editor, caret.offset, -cmd.count, false)
+    caret.moveToMotion(motion)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionShiftArrowRightAction.kt

@@ -16,28 +16,21 @@ import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.api.moveToMotion
 import com.maddyhome.idea.vim.command.Command
-import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.ShiftedArrowKeyHandler
 
-/**
- * @author Alex Plate
- */
-
 @CommandOrMotion(keys = ["<S-Right>"], modes = [Mode.INSERT, Mode.NORMAL, Mode.VISUAL, Mode.SELECT])
-class MotionShiftRightAction : ShiftedArrowKeyHandler(true) {
+class MotionShiftArrowRightAction : ShiftedArrowKeyHandler(true) {
 
   override val type: Command.Type = Command.Type.OTHER_READONLY
 
   override fun motionWithKeyModel(editor: VimEditor, caret: VimCaret, context: ExecutionContext, cmd: Command) {
-    val vertical = injector.motion.getHorizontalMotion(editor, caret, cmd.count, true)
-    caret.moveToMotion(vertical)
+    val motion = injector.motion.getHorizontalMotion(editor, caret, cmd.count, true)
+    caret.moveToMotion(motion)
   }
 
   override fun motionWithoutKeyModel(editor: VimEditor, context: ExecutionContext, cmd: Command) {
     val caret = editor.currentCaret()
-    val newOffset = injector.motion.findOffsetOfNextWord(editor, caret.offset, cmd.count, false)
-    if (newOffset is Motion.AbsoluteOffset) {
-      caret.moveToOffset(newOffset.offset)
-    }
+    val motion = injector.motion.findOffsetOfNextWord(editor, caret.offset, cmd.count, false)
+    caret.moveToMotion(motion)
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/MotionSpaceAction.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2003-2024 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package com.maddyhome.idea.vim.action.motion.leftright
+
+import com.intellij.vim.annotations.CommandOrMotion
+import com.intellij.vim.annotations.Mode
+import com.maddyhome.idea.vim.api.ExecutionContext
+import com.maddyhome.idea.vim.api.ImmutableVimCaret
+import com.maddyhome.idea.vim.api.VimEditor
+import com.maddyhome.idea.vim.api.injector
+import com.maddyhome.idea.vim.api.options
+import com.maddyhome.idea.vim.command.Argument
+import com.maddyhome.idea.vim.command.MotionType
+import com.maddyhome.idea.vim.command.OperatorArguments
+import com.maddyhome.idea.vim.handler.Motion
+import com.maddyhome.idea.vim.handler.MotionActionHandler
+
+@CommandOrMotion(keys = ["<Space>"], modes = [Mode.NORMAL, Mode.VISUAL])
+open class MotionSpaceAction(private val allowPastEnd: Boolean = false) : MotionActionHandler.ForEachCaret() {
+  override fun getOffset(
+    editor: VimEditor,
+    caret: ImmutableVimCaret,
+    context: ExecutionContext,
+    argument: Argument?,
+    operatorArguments: OperatorArguments,
+  ): Motion {
+    val allowWrap = injector.options(editor).whichwrap.contains("s")
+    return injector.motion.getHorizontalMotion(editor, caret, operatorArguments.count1, allowPastEnd, allowWrap)
+  }
+
+  override val motionType: MotionType = MotionType.EXCLUSIVE
+}
+
+@CommandOrMotion(keys = ["<Space>"], modes = [Mode.OP_PENDING])
+class MotionSpaceOpPendingModeAction : MotionSpaceAction(allowPastEnd = true)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/leftright/TillCharacterMotion.kt

@@ -15,15 +15,12 @@ import com.maddyhome.idea.vim.api.ImmutableVimCaret
 import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.command.Argument
-import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.Direction
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.handler.toMotionOrError
-import com.maddyhome.idea.vim.helper.enumSetOf
-import java.util.*
 
 enum class TillCharacterMotionType {
   LAST_F,
@@ -51,9 +48,6 @@ sealed class TillCharacterMotion(
   private val finishBeforeCharacter: Boolean,
 ) : MotionActionHandler.ForEachCaret() {
   override val argumentType: Argument.Type = Argument.Type.DIGRAPH
-
-  override val flags: EnumSet<CommandFlags> = enumSetOf(CommandFlags.FLAG_ALLOW_DIGRAPH)
-
   override val motionType: MotionType =
     if (direction == Direction.BACKWARDS) MotionType.EXCLUSIVE else MotionType.INCLUSIVE
 
@@ -64,7 +58,7 @@ sealed class TillCharacterMotion(
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
     val res = if (finishBeforeCharacter) {
       injector.motion
         .moveCaretToBeforeNextCharacterOnLine(

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/mark/MotionGotoFileMarkAction.kt

@@ -37,7 +37,7 @@ class MotionGotoFileMarkAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, false)
@@ -57,7 +57,7 @@ class MotionGotoFileMarkNoSaveJumpAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, false)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/mark/MotionGotoFileMarkLineAction.kt

@@ -37,7 +37,7 @@ class MotionGotoFileMarkLineAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, false)
@@ -57,7 +57,7 @@ class MotionGotoFileMarkLineNoSaveJumpAction : MotionActionHandler.ForEachCaret(
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, true)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/mark/MotionGotoMarkAction.kt

@@ -37,7 +37,7 @@ class MotionGotoMarkAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, false)
@@ -57,7 +57,7 @@ class MotionGotoMarkNoSaveJumpAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, false)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/mark/MotionGotoMarkLineAction.kt

@@ -37,7 +37,7 @@ class MotionGotoMarkLineAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, true)
@@ -57,7 +57,7 @@ class MotionGotoMarkLineNoSaveJumpAction : MotionActionHandler.ForEachCaret() {
     argument: Argument?,
     operatorArguments: OperatorArguments,
   ): Motion {
-    if (argument == null) return Motion.Error
+    if (argument !is Argument.Character) return Motion.Error
 
     val mark = argument.character
     return injector.motion.moveCaretToMark(caret, mark, true)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/mark/MotionMarkAction.kt

@@ -24,7 +24,6 @@ class MotionMarkAction : VimActionHandler.SingleExecution() {
   override val argumentType: Argument.Type = Argument.Type.CHARACTER
 
   override fun execute(editor: VimEditor, context: ExecutionContext, cmd: Command, operatorArguments: OperatorArguments): Boolean {
-    val argument = cmd.argument
-    return argument != null && injector.markService.setMark(editor, argument.character)
+    return cmd.argument.let { it is Argument.Character && injector.markService.setMark(editor, it.character) }
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/select/motion/SelectMotionArrowLeftAction.kt

@@ -18,6 +18,7 @@ import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
+import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.handler.toMotion
@@ -28,7 +29,7 @@ import com.maddyhome.idea.vim.options.OptionConstants
  */
 
 @CommandOrMotion(keys = ["<Left>"], modes = [Mode.SELECT])
-class SelectMotionLeftAction : MotionActionHandler.ForEachCaret() {
+class SelectMotionArrowLeftAction : MotionActionHandler.ForEachCaret() {
 
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
@@ -58,6 +59,6 @@ class SelectMotionLeftAction : MotionActionHandler.ForEachCaret() {
   }
 
   private companion object {
-    private val logger = injector.getLogger(SelectMotionLeftAction::class.java)
+    private val logger = vimLogger<SelectMotionArrowLeftAction>()
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/action/motion/select/motion/SelectMotionArrowRightAction.kt

@@ -18,6 +18,7 @@ import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.command.Argument
 import com.maddyhome.idea.vim.command.MotionType
 import com.maddyhome.idea.vim.command.OperatorArguments
+import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.handler.toMotion
@@ -28,7 +29,7 @@ import com.maddyhome.idea.vim.options.OptionConstants
  */
 
 @CommandOrMotion(keys = ["<Right>"], modes = [Mode.SELECT])
-class SelectMotionRightAction : MotionActionHandler.ForEachCaret() {
+class SelectMotionArrowRightAction : MotionActionHandler.ForEachCaret() {
 
   override val motionType: MotionType = MotionType.EXCLUSIVE
 
@@ -58,6 +59,6 @@ class SelectMotionRightAction : MotionActionHandler.ForEachCaret() {
   }
 
   private companion object {
-    private val logger = injector.getLogger(SelectMotionRightAction::class.java)
+    private val logger = vimLogger<SelectMotionArrowRightAction>()
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimChangeGroup.kt

@@ -37,10 +37,26 @@ interface VimChangeGroup {
 
   fun initInsert(editor: VimEditor, context: ExecutionContext, mode: Mode)
 
-  fun processEscape(editor: VimEditor, context: ExecutionContext?, operatorArguments: OperatorArguments)
+  /**
+   * Enter Insert mode for block selection.
+   *
+   * Given a [TextRange] representing a block selection, position the primary caret either at the start column of the
+   * selection for insert, or the end of the first line for append. Then set the insert repeat counts for the extent of
+   * the block selection and start Insert mode.
+   *
+   * @param editor The Vim editor instance.
+   * @param context The execution context.
+   * @param range The range of text representing the block selection.
+   * @param append Whether to insert before the range, or append after it.
+   * @return True if the block was successfully inserted, false otherwise.
+   */
+  fun initBlockInsert(editor: VimEditor, context: ExecutionContext, range: TextRange, append: Boolean): Boolean
+
+  fun processEscape(editor: VimEditor, context: ExecutionContext?)
 
   fun processEnter(editor: VimEditor, caret: VimCaret, context: ExecutionContext)
   fun processEnter(editor: VimEditor, context: ExecutionContext)
+  fun processBackspace(editor: VimEditor, context: ExecutionContext)
 
   fun processPostChangeModeSwitch(editor: VimEditor, context: ExecutionContext, toSwitch: Mode)
 
@@ -58,13 +74,7 @@ interface VimChangeGroup {
 
   fun deleteEndOfLine(editor: VimEditor, caret: VimCaret, count: Int, operatorArguments: OperatorArguments): Boolean
 
-  fun deleteJoinLines(
-    editor: VimEditor,
-    caret: VimCaret,
-    count: Int,
-    spaces: Boolean,
-    operatorArguments: OperatorArguments,
-  ): Boolean
+  fun deleteJoinLines(editor: VimEditor, caret: VimCaret, count: Int, spaces: Boolean): Boolean
 
   fun processKey(editor: VimEditor, key: KeyStroke, processResultBuilder: KeyProcessResult.KeyProcessResultBuilder): Boolean
 
@@ -92,7 +102,6 @@ interface VimChangeGroup {
     range: TextRange,
     type: SelectionType?,
     isChange: Boolean,
-    operatorArguments: OperatorArguments,
     saveToRegister: Boolean = true,
   ): Boolean
   fun changeCharacters(editor: VimEditor, caret: VimCaret, operatorArguments: OperatorArguments): Boolean
@@ -112,8 +121,6 @@ interface VimChangeGroup {
 
   fun changeCaseToggleCharacter(editor: VimEditor, caret: VimCaret, count: Int): Boolean
 
-  fun blockInsert(editor: VimEditor, context: ExecutionContext, range: TextRange, append: Boolean, operatorArguments: OperatorArguments): Boolean
-
   fun changeCaseRange(editor: VimEditor, caret: VimCaret, range: TextRange, type: ChangeCaseType): Boolean
 
   fun changeRange(
@@ -122,7 +129,6 @@ interface VimChangeGroup {
     range: TextRange,
     type: SelectionType,
     context: ExecutionContext,
-    operatorArguments: OperatorArguments,
   ): Boolean
 
   fun changeCaseMotion(editor: VimEditor, caret: VimCaret, context: ExecutionContext?, type: ChangeCaseType, argument: Argument, operatorArguments: OperatorArguments): Boolean
@@ -187,7 +193,6 @@ interface VimChangeGroup {
     context: ExecutionContext,
     count: Int,
     started: Boolean,
-    operatorArguments: OperatorArguments,
   )
 
   fun type(vimEditor: VimEditor, context: ExecutionContext, key: Char)

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimChangeGroupBase.kt

@@ -15,7 +15,6 @@ import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.command.CommandFlags
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.ChangesListener
-import com.maddyhome.idea.vim.common.OperatedRange
 import com.maddyhome.idea.vim.common.TextRange
 import com.maddyhome.idea.vim.diagnostic.debug
 import com.maddyhome.idea.vim.diagnostic.vimLogger
@@ -24,6 +23,7 @@ import com.maddyhome.idea.vim.group.visual.VimSelection
 import com.maddyhome.idea.vim.handler.EditorActionHandlerBase
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.Motion.AbsoluteOffset
+import com.maddyhome.idea.vim.handler.MotionActionHandler
 import com.maddyhome.idea.vim.helper.CharacterHelper
 import com.maddyhome.idea.vim.helper.CharacterHelper.charType
 import com.maddyhome.idea.vim.helper.NumberType
@@ -111,7 +111,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
         TextRange(caret.offset, endOffset.offset),
         SelectionType.CHARACTER_WISE,
         caret,
-        operatorArguments,
       )
       val pos = caret.offset
       val norm = editor.normalizeOffset(caret.getBufferPosition().line, pos, isChange)
@@ -162,21 +161,21 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     range: TextRange,
     type: SelectionType?,
     caret: VimCaret,
-    operatorArguments: OperatorArguments,
     saveToRegister: Boolean = true,
   ): Boolean {
     var updatedRange = range
+
     // Fix for https://youtrack.jetbrains.net/issue/VIM-35
     if (!range.normalize(editor.fileSize().toInt())) {
-      updatedRange = if (range.startOffset == range.endOffset && range.startOffset == editor.fileSize()
-          .toInt() && range.startOffset != 0
-      ) {
+      updatedRange = if (range.startOffset == range.endOffset
+        && range.startOffset == editor.fileSize().toInt()
+        && range.startOffset != 0) {
         TextRange(range.startOffset - 1, range.endOffset)
       } else {
         return false
       }
     }
-    val mode = operatorArguments.mode
+    val mode = editor.mode
     if (type == null ||
       (mode == Mode.INSERT || mode == Mode.REPLACE) ||
       !saveToRegister ||
@@ -239,11 +238,10 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     editor: VimEditor,
     context: ExecutionContext,
     count: Int,
-    operatorArguments: OperatorArguments,
   ) {
     val myLastStrokes = lastStrokes ?: return
     for (caret in editor.nativeCarets()) {
-      for (i in 0 until count) {
+      repeat(count) {
         for (lastStroke in myLastStrokes) {
           when (lastStroke) {
             is NativeAction -> {
@@ -252,7 +250,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
             }
 
             is EditorActionHandlerBase -> {
-              injector.actionExecutor.executeVimAction(editor, lastStroke, context, operatorArguments)
+              injector.actionExecutor.executeVimAction(editor, lastStroke, context, OperatorArguments(0, editor.mode))
               strokes.add(lastStroke)
             }
 
@@ -281,7 +279,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     context: ExecutionContext,
     count: Int,
     started: Boolean,
-    operatorArguments: OperatorArguments,
   ) {
     for (caret in editor.nativeCarets()) {
       if (repeatLines > 0) {
@@ -302,17 +299,17 @@ abstract class VimChangeGroupBase : VimChangeGroup {
           val updatedCount = if (started) (if (i == 0) count else count + 1) else count
           if (repeatColumn >= VimMotionGroupBase.LAST_COLUMN) {
             caret.moveToOffset(injector.motion.moveCaretToLineEnd(editor, bufferLine + i, true))
-            repeatInsertText(editor, context, updatedCount, operatorArguments)
+            repeatInsertText(editor, context, updatedCount)
           } else if (editor.getVisualLineLength(visualLine + i) >= repeatColumn) {
             val visualPosition = VimVisualPosition(visualLine + i, repeatColumn, false)
             val inlaysCount = injector.engineEditorHelper.amountOfInlaysBeforeVisualPosition(editor, visualPosition)
             caret.moveToVisualPosition(VimVisualPosition(visualLine + i, repeatColumn + inlaysCount, false))
-            repeatInsertText(editor, context, updatedCount, operatorArguments)
+            repeatInsertText(editor, context, updatedCount)
           }
         }
         caret.moveToOffset(position)
       } else {
-        repeatInsertText(editor, context, count, operatorArguments)
+        repeatInsertText(editor, context, count)
         val position = injector.motion.getHorizontalMotion(editor, caret, -1, false)
         caret.moveToMotion(position)
       }
@@ -330,7 +327,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       val oldFragmentLength = oldFragment.length
 
       // Repeat buffer limits
-      if (repeatCharsCount > Companion.MAX_REPEAT_CHARS_COUNT) {
+      if (repeatCharsCount > MAX_REPEAT_CHARS_COUNT) {
         return
       }
 
@@ -351,7 +348,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       if (oldFragmentLength > 0) {
         val editorDelete = injector.nativeActionManager.deleteAction
         if (editorDelete != null) {
-          for (i in 0 until oldFragmentLength) {
+          repeat(oldFragmentLength) {
             strokes.add(editorDelete)
           }
         }
@@ -370,7 +367,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
         val motionName = if (delta < 0) "VimMotionLeftAction" else "VimMotionRightAction"
         val action = injector.actionExecutor.findVimAction(motionName)!!
         val count = abs(delta)
-        for (i in 0 until count) {
+        repeat(count) {
           positionCaretActions.add(action)
         }
         return positionCaretActions
@@ -449,25 +446,8 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       if (mode == Mode.REPLACE) {
         editor.insertMode = false
       }
-      if (cmd.flags.contains(CommandFlags.FLAG_NO_REPEAT_INSERT)) {
-        val commandState = injector.vimState
-        repeatInsert(
-          editor,
-          context,
-          1,
-          false,
-          OperatorArguments(false, 1, commandState.mode),
-        )
-      } else {
-        val commandState = injector.vimState
-        repeatInsert(
-          editor,
-          context,
-          cmd.count,
-          false,
-          OperatorArguments(false, cmd.count, commandState.mode),
-        )
-      }
+      val count = if (cmd.flags.contains(CommandFlags.FLAG_NO_REPEAT_INSERT)) 1 else cmd.count
+      repeatInsert(editor, context, count, false)
       if (mode == Mode.REPLACE) {
         editor.insertMode = true
       }
@@ -532,9 +512,9 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     exit: Boolean,
     operatorArguments: OperatorArguments,
   ) {
-    repeatInsertText(editor, context, 1, operatorArguments)
+    repeatInsertText(editor, context, 1)
     if (exit) {
-      editor.exitInsertMode(context, operatorArguments)
+      editor.exitInsertMode(context)
     }
   }
 
@@ -544,7 +524,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
    *
    * DEPRECATED. Please, don't use this function directly. Use ModeHelper.exitInsertMode in file ModeExtensions.kt
    */
-  override fun processEscape(editor: VimEditor, context: ExecutionContext?, operatorArguments: OperatorArguments) {
+  override fun processEscape(editor: VimEditor, context: ExecutionContext?) {
     // Get the offset for marks before we exit insert mode - switching from insert to overtype subtracts one from the
     // column offset.
     val markGroup = injector.markService
@@ -553,17 +533,24 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     if (editor.mode is Mode.REPLACE) {
       editor.insertMode = true
     }
-    var cnt = if (lastInsert != null) lastInsert!!.count else 0
-    if (lastInsert != null && lastInsert!!.flags.contains(CommandFlags.FLAG_NO_REPEAT_INSERT)) {
-      cnt = 1
+    val repeatCount0 = lastInsert?.let {
+      // How many times do we want to *repeat* the insert? For a simple insert or change action, this is count-1. But if
+      // the command is an operator+motion, then the count applies to the motion, not the insert/change. I.e., `2cw`
+      // changes two words, rather than inserting the change twice. This is the only place where we need to know who the
+      // count applies to
+      if (CommandFlags.FLAG_NO_REPEAT_INSERT in it.flags || it.action.argumentType == Argument.Type.MOTION) {
+        0
+      } else {
+        it.count - 1
       }
+    } ?: 0
     if (vimDocument != null && vimDocumentListener != null) {
       vimDocument!!.removeChangeListener(vimDocumentListener!!)
       vimDocumentListener = null
     }
     lastStrokes = ArrayList(strokes)
     if (context != null) {
-      injector.changeGroup.repeatInsert(editor, context, if (cnt == 0) 0 else cnt - 1, true, operatorArguments)
+      injector.changeGroup.repeatInsert(editor, context, repeatCount0, true)
     }
     if (editor.mode is Mode.INSERT) {
       updateLastInsertedTextRegister()
@@ -677,7 +664,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       val rangeToDelete = TextRange(startOffset, offset)
       editor.nativeCarets().filter { it != caret && rangeToDelete.contains(it.offset) }
         .forEach { editor.removeCaret(it) }
-      val res = deleteText(editor, rangeToDelete, SelectionType.CHARACTER_WISE, caret, operatorArguments)
+      val res = deleteText(editor, rangeToDelete, SelectionType.CHARACTER_WISE, caret)
       if (editor.usesVirtualSpace) {
         caret.moveToOffset(startOffset)
       } else {
@@ -704,7 +691,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     caret: VimCaret,
     count: Int,
     spaces: Boolean,
-    operatorArguments: OperatorArguments,
   ): Boolean {
     var myCount = count
     if (myCount < 2) myCount = 2
@@ -713,7 +699,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     return if (lline + myCount > total) {
       false
     } else {
-      deleteJoinNLines(editor, caret, lline, myCount, spaces, operatorArguments)
+      deleteJoinNLines(editor, caret, lline, myCount, spaces)
     }
   }
 
@@ -731,12 +717,14 @@ abstract class VimChangeGroupBase : VimChangeGroup {
   ): Boolean {
     logger.debug { "processKey($key)" }
     if (key.keyChar != KeyEvent.CHAR_UNDEFINED) {
+      editor.replaceMask?.recordChangeAtCaret(editor)
       processResultBuilder.addExecutionStep { _, lambdaEditor, lambdaContext -> type(lambdaEditor, lambdaContext, key.keyChar) }
       return true
     }
 
     // Shift-space
     if (key.keyCode == 32 && key.modifiers and KeyEvent.SHIFT_DOWN_MASK != 0) {
+      editor.replaceMask?.recordChangeAtCaret(editor)
       processResultBuilder.addExecutionStep { _, lambdaEditor, lambdaContext -> type(lambdaEditor, lambdaContext, ' ') }
       return true
     }
@@ -784,7 +772,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       logger.debug("offset=$offset")
     }
     if (offset != -1) {
-      val res = deleteText(editor, TextRange(start, offset), SelectionType.LINE_WISE, caret, operatorArguments)
+      val res = deleteText(editor, TextRange(start, offset), SelectionType.LINE_WISE, caret)
       if (res && caret.offset >= editor.fileSize() && caret.offset != 0) {
         caret.moveToOffset(
           injector.motion.moveCaretToRelativeLineStartSkipLeading(
@@ -807,7 +795,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       lline + count <= total
     }
     if (!allowedExecution) return false
-    for (i in 0 until executions) {
+    repeat(executions) {
       val joinLinesAction = injector.nativeActionManager.joinLines
       if (joinLinesAction != null) {
         injector.actionExecutor.executeAction(editor, joinLinesAction, context)
@@ -837,7 +825,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     val endLine = editor.offsetToBufferPosition(range.endOffset).line
     var count = endLine - startLine + 1
     if (count < 2) count = 2
-    return deleteJoinNLines(editor, caret, startLine, count, spaces, operatorArguments)
+    return deleteJoinNLines(editor, caret, startLine, count, spaces)
   }
 
   override fun joinViaIdeaBySelections(
@@ -874,28 +862,25 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     isChange: Boolean,
     operatorArguments: OperatorArguments,
   ): Pair<TextRange, SelectionType>? {
+    check(argument is Argument.Motion) { "Unexpected argument: $argument" }
+
     val range = injector.motion.getMotionRange(editor, caret, context, argument, operatorArguments) ?: return null
+    var motionType = argument.getMotionType()
 
     // Delete motion commands that are not linewise become linewise if all the following are true:
     // 1) The range is across multiple lines
     // 2) There is only whitespace before the start of the range
     // 3) There is only whitespace after the end of the range
-    var type: SelectionType = if (argument.motion.isLinewiseMotion()) {
-      SelectionType.LINE_WISE
-    } else {
-      SelectionType.CHARACTER_WISE
-    }
-    val motion = argument.motion
-    if (!isChange && !motion.isLinewiseMotion()) {
+    if (!isChange && motionType != SelectionType.LINE_WISE) {
       val start = editor.offsetToBufferPosition(range.startOffset)
       val end = editor.offsetToBufferPosition(range.endOffset)
-      if (start.line != end.line) {
-        if (!editor.anyNonWhitespace(range.startOffset, -1) && !editor.anyNonWhitespace(range.endOffset, 1)) {
-          type = SelectionType.LINE_WISE
+      if (start.line != end.line
+        && !editor.anyNonWhitespace(range.startOffset, -1)
+        && !editor.anyNonWhitespace(range.endOffset, 1)) {
+        motionType = SelectionType.LINE_WISE
       }
     }
-    }
-    return Pair(range, type)
+    return Pair(range, motionType)
   }
 
   /**
@@ -915,13 +900,12 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     range: TextRange,
     type: SelectionType?,
     isChange: Boolean,
-    operatorArguments: OperatorArguments,
     saveToRegister: Boolean,
   ): Boolean {
     val intendedColumn = caret.vimLastColumn
 
     val removeLastNewLine = removeLastNewLine(editor, range, type)
-    val res = deleteText(editor, range, type, caret, operatorArguments, saveToRegister)
+    val res = deleteText(editor, range, type, caret, saveToRegister)
     var processedCaret = editor.findLastVersionOfCaret(caret) ?: caret
     if (removeLastNewLine) {
       val textLength = editor.fileSize().toInt()
@@ -1040,7 +1024,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     startLine: Int,
     count: Int,
     spaces: Boolean,
-    operatorArguments: OperatorArguments,
   ): Boolean {
     // Don't move the caret until we've successfully deleted text. If we're on the last line, we don't want to move the
     // caret and then be unable to delete
@@ -1057,7 +1040,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
         return i > 1
       }
       // Note that caret isn't moved here; it's only used for register + mark storage
-      deleteText(editor, TextRange(startOffset, endOffset), null, caret, operatorArguments)
+      deleteText(editor, TextRange(startOffset, endOffset), null, caret)
       if (spaces && !hasTrailingWhitespace) {
         insertText(editor, caret, startOffset, " ")
       }
@@ -1144,8 +1127,8 @@ abstract class VimChangeGroupBase : VimChangeGroup {
   ): Boolean {
     var count0 = operatorArguments.count0
     // Vim treats cw as ce and cW as cE if cursor is on a non-blank character
-    val motion = argument.motion
-    val id = motion.action.id
+    var motionArgument = argument as? Argument.Motion ?: return false
+    val id = motionArgument.motion.id
     var kludge = false
     val bigWord = id == VIM_MOTION_BIG_WORD_RIGHT
     val chars = editor.text()
@@ -1155,7 +1138,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       val charType = charType(editor, chars[offset], bigWord)
       if (charType !== CharacterHelper.CharacterType.WHITESPACE) {
         val lastWordChar = offset >= fileSize - 1 || charType(editor, chars[offset + 1], bigWord) !== charType
-        if (wordMotions.contains(id) && lastWordChar && motion.count == 1) {
+        if (wordMotions.contains(id) && lastWordChar && operatorArguments.count1 == 1) {
           val res = deleteCharacter(editor, caret, 1, true, operatorArguments)
           if (res) {
             editor.vimChangeActionSwitchMode = Mode.INSERT
@@ -1165,49 +1148,50 @@ abstract class VimChangeGroupBase : VimChangeGroup {
         when (id) {
           VIM_MOTION_WORD_RIGHT -> {
             kludge = true
-            motion.action = injector.actionExecutor.findVimActionOrDie(VIM_MOTION_WORD_END_RIGHT)
+            motionArgument = Argument.Motion(
+              injector.actionExecutor.findVimActionOrDie(VIM_MOTION_WORD_END_RIGHT) as MotionActionHandler,
+              motionArgument.argument
+            )
           }
 
           VIM_MOTION_BIG_WORD_RIGHT -> {
             kludge = true
-            motion.action = injector.actionExecutor.findVimActionOrDie(VIM_MOTION_BIG_WORD_END_RIGHT)
+            motionArgument = Argument.Motion(
+              injector.actionExecutor.findVimActionOrDie(VIM_MOTION_BIG_WORD_END_RIGHT) as MotionActionHandler,
+              motionArgument.argument
+            )
           }
 
           VIM_MOTION_CAMEL_RIGHT -> {
             kludge = true
-            motion.action = injector.actionExecutor.findVimActionOrDie(VIM_MOTION_CAMEL_END_RIGHT)
+            motionArgument = Argument.Motion(
+              injector.actionExecutor.findVimActionOrDie(VIM_MOTION_CAMEL_END_RIGHT) as MotionActionHandler,
+              motionArgument.argument
+            )
           }
         }
       }
     }
     if (kludge) {
-      val cnt = operatorArguments.count1 * motion.count
-      val pos1 = injector.searchHelper.findNextWordEnd(editor, offset, cnt, bigWord, false)
-      val pos2 = injector.searchHelper.findNextWordEnd(editor, pos1, -cnt, bigWord, false)
+      val pos1 = injector.searchHelper.findNextWordEnd(editor, offset, operatorArguments.count1, bigWord, false)
+      val pos2 = injector.searchHelper.findNextWordEnd(editor, pos1, -operatorArguments.count1, bigWord, false)
       if (logger.isDebug()) {
         logger.debug("pos=$offset")
         logger.debug("pos1=$pos1")
         logger.debug("pos2=$pos2")
         logger.debug("count=" + operatorArguments.count1)
-        logger.debug("arg.count=" + motion.count)
       }
-      if (pos2 == offset) {
-        if (operatorArguments.count1 > 1) {
+      if (pos2 == offset && operatorArguments.count1 > 1) {
         count0--
-        } else if (motion.count > 1) {
-          motion.rawCount = motion.count - 1
-        } else {
-          motion.flags = EnumSet.noneOf(CommandFlags::class.java)
-        }
       }
     }
     val (first, second) = getDeleteRangeAndType(
       editor,
       caret,
       context,
-      argument,
+      motionArgument,
       true,
-      operatorArguments.withCount0(count0),
+      operatorArguments.copy(count0 = count0),
     ) ?: return false
     return changeRange(
       editor,
@@ -1215,7 +1199,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
       first,
       second,
       context,
-      operatorArguments,
     )
   }
 
@@ -1240,7 +1223,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
    * @param caret             The caret to be moved after range deletion
    * @param range             The range to change
    * @param type              The type of the range
-   * @param operatorArguments
    * @return true if able to delete the range, false if not
    */
   override fun changeRange(
@@ -1249,7 +1231,6 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     range: TextRange,
     type: SelectionType,
     context: ExecutionContext,
-    operatorArguments: OperatorArguments,
   ): Boolean {
     var col = 0
     var lines = 0
@@ -1262,7 +1243,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     }
     val after = range.endOffset >= editor.fileSize()
     val lp = editor.offsetToBufferPosition(injector.motion.moveCaretToCurrentLineStartSkipLeading(editor, caret))
-    val res = deleteRange(editor, caret, range, type, true, operatorArguments)
+    val res = deleteRange(editor, caret, range, type, true)
     val updatedCaret = editor.findLastVersionOfCaret(caret) ?: caret
     if (res) {
       if (type === SelectionType.LINE_WISE) {
@@ -1924,7 +1905,7 @@ abstract class VimChangeGroupBase : VimChangeGroup {
               pos++
             }
             if (pos > wsoff) {
-              deleteText(editor, TextRange(wsoff, pos), null, caret, operatorArguments, true)
+              deleteText(editor, TextRange(wsoff, pos), null, caret, true)
             }
           }
         }
@@ -1956,23 +1937,21 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     }
   }
 
-  override fun blockInsert(
+  override fun initBlockInsert(
     editor: VimEditor,
     context: ExecutionContext,
     range: TextRange,
     append: Boolean,
-    operatorArguments: OperatorArguments,
   ): Boolean {
     val lines = getLinesCountInVisualBlock(editor, range)
     val startPosition = editor.offsetToBufferPosition(range.startOffset)
-    val mode = operatorArguments.mode
-    val visualBlockMode = mode is Mode.VISUAL && mode.selectionType === SelectionType.BLOCK_WISE
+    // Note that when called, we're likely to have moved from Visual (block) to Normal, which means all secondary carets
+    // will have been removed. Even if not, this would move them all to the same location, which would remove them and
+    // leave only the primary caret.
     for (caret in editor.carets()) {
       val line = startPosition.line
       var column = startPosition.column
-      if (!visualBlockMode) {
-        column = 0
-      } else if (append) {
+      if (append) {
         column += range.maxLength
         if (caret.vimLastColumn == VimMotionGroupBase.LAST_COLUMN) {
           column = VimMotionGroupBase.LAST_COLUMN
@@ -1984,18 +1963,10 @@ abstract class VimChangeGroupBase : VimChangeGroup {
         val offset = editor.getLineEndOffset(line)
         insertText(editor, caret, offset, pad)
       }
-      if (visualBlockMode || !append) {
       caret.moveToInlayAwareOffset(editor.bufferPositionToOffset(BufferPosition(line, column)))
-      }
-      if (visualBlockMode) {
       setInsertRepeat(lines, column, append)
     }
-    }
-    if (visualBlockMode || !append) {
     insertBeforeCursor(editor, context)
-    } else {
-      insertAfterCursor(editor, context)
-    }
     return true
   }
 
@@ -2068,9 +2039,3 @@ abstract class VimChangeGroupBase : VimChangeGroup {
     VimChangeGroup.ChangeCaseType.UPPER -> Character.toUpperCase(ch)
   }
 }
-
-fun OperatedRange.toType(): SelectionType = when (this) {
-  is OperatedRange.Characters -> SelectionType.CHARACTER_WISE
-  is OperatedRange.Lines -> SelectionType.LINE_WISE
-  is OperatedRange.Block -> SelectionType.BLOCK_WISE
-}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimCommandLineService.kt

@@ -8,8 +8,6 @@
 
 package com.maddyhome.idea.vim.api
 
-import com.maddyhome.idea.vim.command.Command
-
 interface VimCommandLineService {
   fun isCommandLineSupported(editor: VimEditor): Boolean
 
@@ -26,7 +24,7 @@ interface VimCommandLineService {
    * @param initialText The initial text for the entry
    */
   fun createSearchPrompt(editor: VimEditor, context: ExecutionContext, label: String, initialText: String): VimCommandLine
-  fun createCommandPrompt(editor: VimEditor, context: ExecutionContext, command: Command, initialText: String): VimCommandLine
+  fun createCommandPrompt(editor: VimEditor, context: ExecutionContext, count0: Int, initialText: String): VimCommandLine
 
   @Deprecated("Please use ModalInputService.create()")
   fun createWithoutShortcuts(editor: VimEditor, context: ExecutionContext, label: String, initText: String): VimCommandLine

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimCommandLineServiceBase.kt

@@ -8,7 +8,6 @@
 
 package com.maddyhome.idea.vim.api
 
-import com.maddyhome.idea.vim.command.Command
 import com.maddyhome.idea.vim.ex.ExException
 import com.maddyhome.idea.vim.state.mode.Mode
 import com.maddyhome.idea.vim.state.mode.ReturnableFromCmd
@@ -50,15 +49,15 @@ abstract class VimCommandLineServiceBase : VimCommandLineService {
     return createCommandLinePrompt(editor, context, removeSelections = false, label, initialText)
   }
 
-  override fun createCommandPrompt(editor: VimEditor, context: ExecutionContext, command: Command, initialText: String): VimCommandLine {
-    val rangeText = getRange(editor, command)
+  override fun createCommandPrompt(editor: VimEditor, context: ExecutionContext, count0: Int, initialText: String): VimCommandLine {
+    val rangeText = getRange(editor, count0)
     return createCommandLinePrompt(editor, context, removeSelections = true, label = ":", rangeText + initialText)
   }
 
-  protected fun getRange(editor: VimEditor, cmd: Command) = when {
+  protected fun getRange(editor: VimEditor, count0: Int) = when {
     editor.inVisualMode -> "'<,'>"
-    cmd.rawCount == 1 -> "."
-    cmd.rawCount > 1 -> ".,.+" + (cmd.count - 1)
+    count0 == 1 -> "."
+    count0 > 1 -> ".,.+" + (count0 - 1)
     else -> ""
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimEditor.kt

@@ -11,6 +11,7 @@ package com.maddyhome.idea.vim.api
 import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.LiveRange
 import com.maddyhome.idea.vim.common.TextRange
+import com.maddyhome.idea.vim.common.VimEditorReplaceMask
 import com.maddyhome.idea.vim.state.mode.Mode
 import com.maddyhome.idea.vim.state.mode.ReturnTo
 import com.maddyhome.idea.vim.state.mode.SelectionType
@@ -128,6 +129,7 @@ interface VimEditor {
   val lfMakesNewLine: Boolean
   var vimChangeActionSwitchMode: Mode?
   val indentConfig: VimIndentConfig
+  var replaceMask: VimEditorReplaceMask?
 
   fun fileSize(): Long
 
@@ -244,7 +246,9 @@ interface VimEditor {
   // Can be used as a key to store something for specific project
   val projectId: String
 
-  fun exitInsertMode(context: ExecutionContext, operatorArguments: OperatorArguments)
+  @Deprecated("Use overload without OperatorArguments", replaceWith = ReplaceWith("exitInsertMode(context)"))
+  fun exitInsertMode(context: ExecutionContext, operatorArguments: OperatorArguments) { exitInsertMode(context) }
+  fun exitInsertMode(context: ExecutionContext)
   fun exitSelectModeNative(adjustCaret: Boolean)
 
   var vimLastSelectionType: SelectionType?

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimEditorBase.kt

@@ -8,6 +8,7 @@
 
 package com.maddyhome.idea.vim.api
 
+import com.maddyhome.idea.vim.common.forgetAllReplaceMasks
 import com.maddyhome.idea.vim.state.mode.Mode
 
 abstract class VimEditorBase : VimEditor {
@@ -18,6 +19,9 @@ abstract class VimEditorBase : VimEditor {
       if (vimState.mode == value) return
 
       val oldValue = vimState.mode
+      if (oldValue == Mode.REPLACE) {
+        forgetAllReplaceMasks()
+      }
       updateMode(value)
       injector.listenersNotifier.notifyModeChanged(this, oldValue)
     }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimKeyGroup.kt

@@ -10,17 +10,17 @@ package com.maddyhome.idea.vim.api
 import com.maddyhome.idea.vim.action.change.LazyVimCommand
 import com.maddyhome.idea.vim.command.MappingMode
 import com.maddyhome.idea.vim.extension.ExtensionHandler
-import com.maddyhome.idea.vim.key.CommandPartNode
 import com.maddyhome.idea.vim.key.KeyMapping
 import com.maddyhome.idea.vim.key.KeyMappingLayer
 import com.maddyhome.idea.vim.key.MappingInfo
 import com.maddyhome.idea.vim.key.MappingOwner
+import com.maddyhome.idea.vim.key.RootNode
 import com.maddyhome.idea.vim.key.ShortcutOwnerInfo
 import com.maddyhome.idea.vim.vimscript.model.expressions.Expression
 import javax.swing.KeyStroke
 
 interface VimKeyGroup {
-  fun getKeyRoot(mappingMode: MappingMode): CommandPartNode<LazyVimCommand>
+  fun getKeyRoot(mappingMode: MappingMode): RootNode<LazyVimCommand>
   fun getKeyMappingLayer(mode: MappingMode): KeyMappingLayer
   fun getActions(editor: VimEditor, keyStroke: KeyStroke): List<NativeAction>
   fun getKeymapConflicts(keyStroke: KeyStroke): List<NativeAction>

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimKeyGroupBase.kt

@@ -12,7 +12,6 @@ import com.maddyhome.idea.vim.action.change.LazyVimCommand
 import com.maddyhome.idea.vim.command.MappingMode
 import com.maddyhome.idea.vim.extension.ExtensionHandler
 import com.maddyhome.idea.vim.handler.EditorActionHandlerBase
-import com.maddyhome.idea.vim.key.CommandPartNode
 import com.maddyhome.idea.vim.key.KeyMapping
 import com.maddyhome.idea.vim.key.KeyMappingLayer
 import com.maddyhome.idea.vim.key.MappingInfo
@@ -30,7 +29,7 @@ abstract class VimKeyGroupBase : VimKeyGroup {
   @JvmField
   val myShortcutConflicts: MutableMap<KeyStroke, ShortcutOwnerInfo> = LinkedHashMap()
   val requiredShortcutKeys: MutableSet<RequiredShortcut> = HashSet(300)
-  val keyRoots: MutableMap<MappingMode, CommandPartNode<LazyVimCommand>> = EnumMap(MappingMode::class.java)
+  val keyRoots: MutableMap<MappingMode, RootNode<LazyVimCommand>> = EnumMap(MappingMode::class.java)
   val keyMappings: MutableMap<MappingMode, KeyMapping> = EnumMap(MappingMode::class.java)
 
   override fun removeKeyMapping(modes: Set<MappingMode>, keys: List<KeyStroke>) {
@@ -63,7 +62,7 @@ abstract class VimKeyGroupBase : VimKeyGroup {
    * @param mappingMode The mapping mode
    * @return The key mapping tree root
    */
-  override fun getKeyRoot(mappingMode: MappingMode): CommandPartNode<LazyVimCommand> = keyRoots.getOrPut(mappingMode) { RootNode() }
+  override fun getKeyRoot(mappingMode: MappingMode): RootNode<LazyVimCommand> = keyRoots.getOrPut(mappingMode) { RootNode(mappingMode.name.get(0).lowercase()) }
 
   override fun getKeyMappingLayer(mode: MappingMode): KeyMappingLayer = getKeyMapping(mode)
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/api/VimMotionGroupBase.kt

@@ -15,6 +15,7 @@ import com.maddyhome.idea.vim.command.OperatorArguments
 import com.maddyhome.idea.vim.common.Graphemes
 import com.maddyhome.idea.vim.common.TextRange
 import com.maddyhome.idea.vim.group.findMatchingPairOnCurrentLine
+import com.maddyhome.idea.vim.handler.ExternalActionHandler
 import com.maddyhome.idea.vim.handler.Motion
 import com.maddyhome.idea.vim.handler.Motion.AbsoluteOffset
 import com.maddyhome.idea.vim.handler.MotionActionHandler
@@ -116,9 +117,9 @@ abstract class VimMotionGroupBase : VimMotionGroup {
     val text = editor.text()
     val oldOffset = caret.offset
     var current = oldOffset
-    for (i in 0 until count.absoluteValue) {
+    repeat(count.absoluteValue) {
       val newOffset = if (count > 0) Graphemes.next(text, current) else Graphemes.prev(text, current)
-      current = newOffset ?: break
+      current = newOffset ?: return@repeat
     }
 
     val offset = if (allowWrap) {
@@ -313,50 +314,51 @@ abstract class VimMotionGroupBase : VimMotionGroup {
     argument: Argument,
     operatorArguments: OperatorArguments,
   ): TextRange? {
+    if (argument !is Argument.Motion) {
+      throw RuntimeException("Unexpected argument passed to getMotionRange2: $argument")
+    }
+
     var start: Int
     var end: Int
-    if (argument.type === Argument.Type.OFFSETS) {
-      val offsets = argument.offsets[caret] ?: return null
-      val (first, second) = offsets.getNativeStartAndEnd()
-      start = first
-      end = second
-    } else {
-      val cmd = argument.motion
-      // Normalize the counts between the command and the motion argument
-      val cnt = cmd.count * operatorArguments.count1
-      val raw = if (operatorArguments.count0 == 0 && cmd.rawCount == 0) 0 else cnt
-      val cmdAction = cmd.action
-      if (cmdAction is MotionActionHandler) {
+
+    val action = argument.motion
+    when (action) {
+      is MotionActionHandler -> {
         // This is where we are now
         start = caret.offset
 
         // Execute the motion (without moving the cursor) and get where we end
-        val motion =
-          cmdAction.getHandlerOffset(editor, caret, context, cmd.argument, operatorArguments.withCount0(raw))
+        val motion = action.getHandlerOffset(editor, caret, context, argument.argument, operatorArguments)
+        if (Motion.Error == motion || Motion.NoMotion == motion) return null
 
-        // Invalid motion
-        if (Motion.Error == motion) return null
-        if (Motion.NoMotion == motion) return null
         end = (motion as AbsoluteOffset).offset
 
         // If inclusive, add the last character to the range
-        if (cmdAction.motionType === MotionType.INCLUSIVE) {
+        if (action.motionType === MotionType.INCLUSIVE) {
           if (start > end) {
             if (start < editor.fileSize()) start++
           } else {
             if (end < editor.fileSize()) end++
           }
         }
-      } else if (cmdAction is TextObjectActionHandler) {
-        val range: TextRange = cmdAction.getRange(editor, caret, context, cnt, raw)
+      }
+
+      is TextObjectActionHandler -> {
+        val range: TextRange = action.getRange(editor, caret, context, operatorArguments.count1, operatorArguments.count0)
           ?: return null
         start = range.startOffset
         end = range.endOffset
-        if (cmd.isLinewiseMotion()) end--
-      } else {
-        throw RuntimeException(
-          "Commands doesn't take " + cmdAction.javaClass.simpleName + " as an operator",
-        )
+        if (argument.isLinewiseMotion()) end--
+      }
+
+      is ExternalActionHandler -> {
+        val range: TextRange = action.getRange(caret) ?: return null
+        start = range.startOffset
+        end = range.endOffset
+        if (argument.isLinewiseMotion()) end--
+      }
+
+      else -> throw RuntimeException("Commands doesn't take " + action.javaClass.simpleName + " as an operator")
     }
 
     // Normalize the range
@@ -368,7 +370,7 @@ abstract class VimMotionGroupBase : VimMotionGroup {
 
     // If we are a linewise motion we need to normalize the start and stop then move the start to the beginning
     // of the line and move the end to the end of the line.
-      if (cmd.isLinewiseMotion()) {
+    if (argument.isLinewiseMotion()) {
       if (caret.getBufferPosition().line != editor.lineCount() - 1) {
         start = editor.getLineStartForOffset(start)
         end = min((editor.getLineEndForOffset(end) + 1).toLong(), editor.fileSize()).toInt()
@@ -377,19 +379,19 @@ abstract class VimMotionGroupBase : VimMotionGroup {
         end = editor.getLineEndForOffset(end)
       }
     }
-    }
 
     // This is a kludge for dw, dW, and d[w. Without this kludge, an extra newline is operated when it shouldn't be.
     val text = editor.text().subSequence(start, end).toString()
     val lastNewLine = text.lastIndexOf('\n')
     if (lastNewLine > 0) {
-      val id = argument.motion.action.id
+      val id = action.id
       if (id == "VimMotionWordRightAction" || id == "VimMotionBigWordRightAction" || id == "VimMotionCamelRightAction") {
         if (!editor.anyNonWhitespace(end, -1)) {
           end = start + lastNewLine
         }
       }
     }
+
     return TextRange(start, end)
   }
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/Argument.kt

@@ -8,51 +8,88 @@
 
 package com.maddyhome.idea.vim.command
 
-import com.maddyhome.idea.vim.api.ExecutionContext
-import com.maddyhome.idea.vim.api.ImmutableVimCaret
-import com.maddyhome.idea.vim.api.VimEditor
-import com.maddyhome.idea.vim.group.visual.VimSelection
-import com.maddyhome.idea.vim.handler.Motion
+import com.maddyhome.idea.vim.handler.EditorActionHandlerBase
+import com.maddyhome.idea.vim.handler.ExternalActionHandler
 import com.maddyhome.idea.vim.handler.MotionActionHandler
-import java.util.*
+import com.maddyhome.idea.vim.handler.TextObjectActionHandler
+import com.maddyhome.idea.vim.state.mode.SelectionType
 
 /**
- * This represents a command argument.
- * TODO please make it a sealed class and not a giant collection of fields with default values, it's not safe
+ * Represents an argument to a command's action
+ *
+ * A [Command] is made up of an optional register and count, and an action. That action might be a simple command such
+ * as `i` to start Insert mode, or a motion `w` to move to the next word. Or it might require an argument, such as a
+ * character like in the motion `fx` or an ex-string in the command `d/foo`. Or it might be another action, representing
+ * a motion, such as `dw`. That motion argument's action might itself have an action (`dfx`).
  */
-class Argument private constructor(
-  val character: Char = 0.toChar(),
-  val motion: Command = EMPTY_COMMAND,
-  val offsets: Map<ImmutableVimCaret, VimSelection> = emptyMap(),
-  val string: String = "",
-  val processing: ((String) -> Unit)? = null,
-  val type: Type,
-) {
-  constructor(motionArg: Command) : this(motion = motionArg, type = Type.MOTION)
-  constructor(charArg: Char) : this(character = charArg, type = Type.CHARACTER)
-  constructor(label: Char, strArg: String, processing: ((String) -> Unit)?) : this(character = label, string = strArg, processing = processing, type = Type.EX_STRING)
-  constructor(offsets: Map<ImmutableVimCaret, VimSelection>) : this(offsets = offsets, type = Type.OFFSETS)
+sealed class Argument {
+  /** A simple character argument */
+  class Character(val character: Char) : Argument()
 
+  /** An argument representing the user's input from the Ex command line, typically a search string */
+  class ExString(val label: Char, val string: String, val processing: ((String) -> Unit)?) : Argument()
+
+  /**
+   * Represents an argument that is a motion. Used by operator commands
+   *
+   * A command is either an action (like `i`), a motion (like `w`) or an operator that takes a motion as an argument
+   * (like `dw`). A motion argument is a motion action handler with its own optional argument. The motion action handler
+   * could be a [MotionActionHandler] or [TextObjectActionHandler], or even the [ExternalActionHandler] that tracks the
+   * caret moves from an external action such as EasyMotion/AceJump. A motion might be a simple motion such as `w` to
+   * move a word, or require a character argument (`f`), or even an ex-string (`/foo`).
+   *
+   * Note that a motion argument does not have a count - that is owned by the fully built command. When executing the
+   * command, the count applies to the motion action, not the operator action. This just means the operator action
+   * does not use the count. (`3i` means insert the following typed text three times. But `3cw` means change the next
+   * three words with the following inserted text, rather than change the next word by inserting the following text
+   * three times.)
+   *
+   * @see Command
+   */
+  class Motion private constructor(val motion: EditorActionHandlerBase, val argument: Argument? = null) : Argument() {
+    constructor(motion: MotionActionHandler, argument: Argument?) : this(motion as EditorActionHandlerBase, argument)
+    constructor(motion: TextObjectActionHandler) : this(motion as EditorActionHandlerBase)
+    constructor(motion: ExternalActionHandler) : this (motion as EditorActionHandlerBase)
+
+    fun getMotionType() = if (isLinewiseMotion()) SelectionType.LINE_WISE else SelectionType.CHARACTER_WISE
+
+    fun isLinewiseMotion(): Boolean {
+      return motion.let {
+        when (it) {
+          is TextObjectActionHandler -> it.visualType == TextObjectVisualType.LINE_WISE
+          is MotionActionHandler -> it.motionType == MotionType.LINE_WISE
+          is ExternalActionHandler -> it.isLinewiseMotion
+          else -> error("Command is not a motion: $motion")
+        }
+      }
+    }
+
+    fun withArgument(argument: Argument) = Motion(motion, argument)
+  }
+
+  /**
+   * Represents the type of argument, or the type of an expected argument while entering a command
+   */
   enum class Type {
-    MOTION, CHARACTER, DIGRAPH, EX_STRING, OFFSETS
-  }
 
-  companion object {
-    @JvmField
-    val EMPTY_COMMAND: Command = Command(
-      0,
-      object : MotionActionHandler.SingleExecution() {
-        override fun getOffset(
-          editor: VimEditor,
-          context: ExecutionContext,
-          argument: Argument?,
-          operatorArguments: OperatorArguments,
-        ) = Motion.NoMotion
+    /**
+     * A motion argument used to complete an operator, such as `dw` or `diw`
+     *
+     * A motion argument will often have its own argument, such as when deleting up to the next occurrence of a
+     * character, as in `dfx`.
+     */
+    MOTION,
 
-        override val motionType: MotionType = MotionType.EXCLUSIVE
-      },
-      Command.Type.MOTION,
-      EnumSet.noneOf(CommandFlags::class.java),
-    )
+    /** A character argument, such as the character to move to with the `f` command. */
+    CHARACTER,
+
+    /**
+     * Used to represent an expected argument type rather than an actual argument type
+     *
+     * When building a command, an operator can say that it expects a digraph or literal argument, in which case the key
+     * handler will allow `<C-K>`, `<C-V>` and `<C-Q>`, and start the digraph state machine. The finished digraph is
+     * converted into a character, and a character argument is added to the operator action.
+     */
+    DIGRAPH
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/Command.kt

@@ -8,34 +8,47 @@
 
 package com.maddyhome.idea.vim.command
 
-import com.maddyhome.idea.vim.api.ExecutionContext
-import com.maddyhome.idea.vim.api.VimCaret
-import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.handler.EditorActionHandlerBase
-import com.maddyhome.idea.vim.handler.MotionActionHandler
-import com.maddyhome.idea.vim.handler.TextObjectActionHandler
 import java.util.*
 
 /**
- * This represents a single Vim command to be executed (operator, motion, text object, etc.). It may optionally include
- * an argument if appropriate for the command. The command has a count and a type.
+ * This represents a single Vim command to be executed (action, motion, operator+motion, v_textobject, etc.)
+ *
+ * A command is an action, with a type that determines how it is handled, such as [Type.MOTION], [Type.CHANGE],
+ * [Type.OTHER_SELF_SYNCHRONIZED], etc. It also exposes the action's [CommandFlags] which are also used to help execute
+ * the action.
+ *
+ * A command's action can require an argument, which can be either a character (e.g., `fx`) or the input from the Ex
+ * command line. It can also be a motion, in which case the command is an operator+motion, such as `dw`. The motion
+ * argument is an action that might also have an argument, such as `dfx` or `d/foo`.
+ *
+ * A command can optionally include a count and a register. More than one count can be entered, before an operator and
+ * then before the motion argument, e.g. `2d3w`. This is intuitively "delete the next three words, twice", which is the
+ * same as "delete the next six words". While both the operator and motion have a count while being built, the final
+ * command has a single count that is the product of all count components. In this example, the command would have a
+ * final count of `6`.
+ *
+ * Note that for a command that is an operator+motion command, the count applies to the motion, rather than the
+ * operator. For example, `3i` will insert the following typed text three times, while `3cw` will change the next three
+ * words with the following typed text, rather than changing the next word with the typed text three times. The command
+ * still has a single count, and to handle this, the operator action should ignore the count, while the motion action
+ * should use it when calculating the movement.
+ *
+ * As an additional interesting pathological edge case, it's possible to enter a count when selecting a register, and
+ * it's possible to select multiple registers while building a command; the last register wins. This means that
+ * `2"a3"b4"c5d6w` will delete 720 words and store the text in register `c`.
+ *
+ * @see OperatorArguments
  */
 data class Command(
-  var rawCount: Int,
-  var action: EditorActionHandlerBase,
+  val register: Char?,
+  val rawCount: Int,
+  val action: EditorActionHandlerBase,
+  val argument: Argument?,
   val type: Type,
-  var flags: EnumSet<CommandFlags>,
+  val flags: EnumSet<CommandFlags>,
 ) {
 
-  constructor(rawCount: Int, register: Char) : this(
-    rawCount,
-    NonExecutableActionHandler,
-    Type.SELECT_REGISTER,
-    EnumSet.of(CommandFlags.FLAG_EXPECT_MORE),
-  ) {
-    this.register = register
-  }
-
   init {
     action.process(this)
   }
@@ -43,20 +56,7 @@ data class Command(
   val count: Int
     get() = rawCount.coerceAtLeast(1)
 
-  var argument: Argument? = null
-  var register: Char? = null
-
-  fun isLinewiseMotion(): Boolean {
-    return when (action) {
-      is TextObjectActionHandler -> (action as TextObjectActionHandler).visualType == TextObjectVisualType.LINE_WISE
-      is MotionActionHandler -> (action as MotionActionHandler).motionType == MotionType.LINE_WISE
-      else -> error("Command is not a motion: $action")
-    }
-  }
-
-  override fun toString(): String {
-    return "Action = ${action.id}"
-  }
+  override fun toString() = "Action = ${action.id}"
 
   enum class Type {
     /**
@@ -85,10 +85,6 @@ data class Command(
     COPY,
     PASTE,
 
-    /**
-     * Represents commands that select the register.
-     */
-    SELECT_REGISTER,
     OTHER_READONLY,
     OTHER_WRITABLE,
 
@@ -112,18 +108,3 @@ data class Command(
       }
   }
 }
-
-private object NonExecutableActionHandler : EditorActionHandlerBase(false) {
-  override val type: Command.Type
-    get() = error("This action should not be executed")
-
-  override fun baseExecute(
-    editor: VimEditor,
-    caret: VimCaret,
-    context: ExecutionContext,
-    cmd: Command,
-    operatorArguments: OperatorArguments,
-  ): Boolean {
-    error("This action should not be executed")
-  }
-}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/CommandBuilder.kt

@@ -15,67 +15,79 @@ import com.maddyhome.idea.vim.diagnostic.debug
 import com.maddyhome.idea.vim.diagnostic.trace
 import com.maddyhome.idea.vim.diagnostic.vimLogger
 import com.maddyhome.idea.vim.handler.EditorActionHandlerBase
+import com.maddyhome.idea.vim.handler.ExternalActionHandler
+import com.maddyhome.idea.vim.handler.MotionActionHandler
+import com.maddyhome.idea.vim.handler.TextObjectActionHandler
+import com.maddyhome.idea.vim.helper.StrictMode
+import com.maddyhome.idea.vim.helper.noneOfEnum
+import com.maddyhome.idea.vim.key.CommandNode
 import com.maddyhome.idea.vim.key.CommandPartNode
-import com.maddyhome.idea.vim.key.Node
 import com.maddyhome.idea.vim.key.RootNode
 import org.jetbrains.annotations.TestOnly
 import javax.swing.KeyStroke
 
-class CommandBuilder(
+class CommandBuilder private constructor(
   private var currentCommandPartNode: CommandPartNode<LazyVimCommand>,
-  private val commandParts: ArrayDeque<Command>,
+  private val counts: MutableList<Int>,
   private val keyList: MutableList<KeyStroke>,
-  initialUncommittedRawCount: Int,
 ) : Cloneable {
 
-  constructor(
-    currentCommandPartNode: CommandPartNode<LazyVimCommand>,
-    initialUncommittedRawCount: Int = 0
-  ) : this(
-    currentCommandPartNode,
-    ArrayDeque(),
-    mutableListOf(),
-    initialUncommittedRawCount
-  )
+  constructor(rootNode: RootNode<LazyVimCommand>, initialUncommittedRawCount: Int = 0)
+    : this(rootNode, mutableListOf(initialUncommittedRawCount), mutableListOf())
 
-  var commandState: CurrentCommandState = CurrentCommandState.NEW_COMMAND
+  private var commandState: CurrentCommandState = CurrentCommandState.NEW_COMMAND
+  private var selectedRegister: Char? = null
+  private var action: EditorActionHandlerBase? = null
+  private var argument: Argument? = null
+  private var fallbackArgumentType: Argument.Type? = null
 
-  /**
-   * The current uncommitted count for the currently in-progress command part
-   *
-   * TODO: Investigate usages. This value cannot be trusted
-   * TODO: Rename to uncommittedRawCount
-   *
-   * This value is not coerced, and can be 0.
-   *
-   * There are very few reasons for using this value. It is incomplete (the user could type another digit), and there
-   * can be other committed command parts, such as operator and multiple register selections, each of which will can a
-   * count (e.g., `2"a3"b4"c5d6` waiting for a motion). The count is only final after [buildCommand], and then only via
-   * [Command.count] or [Command.rawCount].
-   *
-   * The [aggregatedUncommittedCount] property can be used to get the current total count across all command parts,
-   * although this value is also not guaranteed to be final.
-   */
-  var count: Int = initialUncommittedRawCount
-    private set
+  private val motionArgument
+    get() = argument as? Argument.Motion
 
-  /**
-   * The current aggregated, but uncommitted count for all command parts in the command builder, coerced to 1
-   *
-   * This value multiplies together the count for command parts currently committed, such as operator and multiple
-   * register selections, as well as the current uncommitted count for the next command part. E.g., `2"a3"b4"c5d6` will
-   * multiply each count together to get what would be the final count. All counts are coerced to at least 1 before
-   * multiplying, which means the result will also be at least 1.
-   *
-   * Note that there are very few uses for this value. The final value should be retrieved from [Command.count] or
-   * [Command.rawCount] after a call to [buildCommand]. This value is expected to be used for `'incsearch'`
-   * highlighting.
-   */
-  val aggregatedUncommittedCount: Int
-    get() = (commandParts.map { it.count }.reduceOrNull { acc, i -> acc * i } ?: 1) * count.coerceAtLeast(1)
+  private var currentCount: Int
+    get() = counts.last()
+    set(value) {
+      counts[counts.size - 1] = value
+    }
 
+  /** Provide the typed keys for `'showcmd'` */
   val keys: Iterable<KeyStroke> get() = keyList
 
+  /** Returns true if the command builder is clean and ready to start building */
+  val isEmpty
+    get() = commandState == CurrentCommandState.NEW_COMMAND
+      && selectedRegister == null
+      && counts.size == 1
+      && action == null
+      && argument == null
+      && fallbackArgumentType == null
+
+  /** Returns true if the command is ready to be built and executed */
+  val isReady
+    get() = commandState == CurrentCommandState.READY
+
+  /**
+   * Returns the current total count, as the product of all entered count components. The value is not coerced.
+   *
+   * This value is not reliable! Please use [Command.rawCount] or [Command.count] instead of this function.
+   *
+   * This value is a snapshot of the count for a currently in-progress command, and should not be used for anything
+   * other than reporting on the state of the command. This value is likely to change as the user continues entering the
+   * command. There are very few expected uses of this value. Examples include calculating `'incsearch'` highlighting
+   * for an in-progress search command, or the `v:count` and `v:count1` variables used during an expression mapping.
+   *
+   * The returned value is the product of all count components. In other words, given a command that is an
+   * operator+motion, both the operator and motion can have a count, such as `2d3w`, which means delete the next six
+   * words. Furthermore, Vim allows a count when selecting register, and it is valid to select register multiple times.
+   * E.g., `2"a3"b4"c5d6w` will delete the next 720 words and save the text to the register `c`.
+   *
+   * The returned value is not coerced. If no count components are specified, the returned value is 0. If any components
+   * are specified, the value will naturally be greater than 0.
+   */
+  fun calculateCount0Snapshot(): Int {
+    return if (counts.all { it == 0 }) 0 else counts.map { it.coerceAtLeast(1) }.reduce { acc, i -> acc * i }
+  }
+
   // TODO: Try to remove this. We shouldn't be looking at the unbuilt command
   // This is used by the extension mapping handler, to select the current register before invoking the extension. We
   // need better handling of extensions so that they integrate better with half-built commands, either by finishing or
@@ -84,7 +96,18 @@ class CommandBuilder(
   // still change, if more keys are processed. E.g., it's perfectly valid to select register multiple times `"a"b`.
   // This doesn't cause any issues with existing extensions
   val register: Char?
-    get() = commandParts.lastOrNull { it.register != null }?.register
+    get() = selectedRegister
+
+  // TODO: Try to remove this too. Also used by extension handling
+  fun hasCurrentCommandPartArgument() = motionArgument != null || argument != null
+
+  // TODO: And remove this too. More extension special case code
+  // It's used by the Matchit extension to incorrectly reset the command builder. Extensions need a way to properly
+  // handle the command builder. I.e., they should act like expression mappings, which return keys to evaluate, or an
+  // empty string to leave state as it is - either way, it's an explicit choice. Currently, extensions mostly ignore it
+  fun resetCount() {
+    counts[counts.size - 1] = 0
+  }
 
   /**
    * The argument type for the current in-progress command part's action
@@ -92,79 +115,202 @@ class CommandBuilder(
    * For digraph arguments, this can fall back to [Argument.Type.CHARACTER] if there isn't a digraph match.
    */
   val expectedArgumentType: Argument.Type?
-    get() = fallbackArgumentType ?: commandParts.lastOrNull()?.action?.argumentType
+    get() = fallbackArgumentType
+      ?: motionArgument?.let { return it.motion.argumentType }
+      ?: action?.argumentType
 
-  private var fallbackArgumentType: Argument.Type? = null
-
-  val isReady: Boolean get() = commandState == CurrentCommandState.READY
-  val isEmpty: Boolean get() = commandParts.isEmpty()
-  val isAtDefaultState: Boolean get() = isEmpty && count == 0 && expectedArgumentType == null
-
-  val isExpectingCount: Boolean
-    get() {
-      return commandState == CurrentCommandState.NEW_COMMAND &&
-        expectedArgumentType != Argument.Type.CHARACTER &&
-        expectedArgumentType != Argument.Type.DIGRAPH
-    }
-
-  fun pushCommandPart(action: EditorActionHandlerBase) {
-    logger.trace { "pushCommandPart is executed. action = $action" }
-    commandParts.add(Command(count, action, action.type, action.flags))
-    fallbackArgumentType = null
-    count = 0
-  }
-
-  fun pushCommandPart(register: Char) {
-    logger.trace { "pushCommandPart is executed. register = $register" }
-    // We will never execute this command, but we need to push something to correctly handle counts on either side of a
-    // select register command part. e.g. 2"a2d2w or even crazier 2"a2"a2"a2"a2"a2d2w
-    commandParts.add(Command(count, register))
-    fallbackArgumentType = null
-    count = 0
-  }
+  /**
+   * Returns true if the command builder is waiting for an argument
+   *
+   * The command builder might be waiting for the argument to a simple motion action such as `f`, waiting for a
+   * character to move to, or it might be waiting for the argument to a motion that is itself an argument to an operator
+   * argument. For example, the character argument to `f` in `df{character}`.
+   */
+  val isAwaitingArgument: Boolean
+    get() = expectedArgumentType != null && (motionArgument?.let { it.argument == null } ?: (argument == null))
 
   fun fallbackToCharacterArgument() {
-    logger.trace { "fallbackToCharacterArgument is executed" }
+    logger.trace("fallbackToCharacterArgument is executed")
     // Finished handling DIGRAPH. We either succeeded, in which case handle the converted character, or failed to parse,
     // in which case try to handle input as a character argument.
     assert(expectedArgumentType == Argument.Type.DIGRAPH) { "Cannot move state from $expectedArgumentType to CHARACTER" }
     fallbackArgumentType = Argument.Type.CHARACTER
   }
 
-  fun addKey(key: KeyStroke) {
-    logger.trace { "added key to command builder" }
-    keyList.add(key)
+  fun isAwaitingCharOrDigraphArgument(): Boolean {
+    val awaiting = expectedArgumentType == Argument.Type.CHARACTER || expectedArgumentType == Argument.Type.DIGRAPH
+    logger.debug { "Awaiting char or digraph: $awaiting" }
+    return awaiting
   }
 
+  val isExpectingCount: Boolean
+    get() {
+      return commandState == CurrentCommandState.NEW_COMMAND &&
+        !isRegisterPending &&
+        expectedArgumentType != Argument.Type.CHARACTER &&
+        expectedArgumentType != Argument.Type.DIGRAPH
+    }
+
+  /**
+   * Returns true if the user has typed some count characters
+   *
+   * Used to know if `0` should be mapped or not. Vim allows "0" to be mapped, but not while entering a count. Also used
+   * to know if there are count characters available to delete.
+   */
+  fun hasCountCharacters() = currentCount > 0
+
   fun addCountCharacter(key: KeyStroke) {
-    count = (count * 10) + (key.keyChar - '0')
+    currentCount = (currentCount * 10) + (key.keyChar - '0')
     // If count overflows and flips negative, reset to 999999999L. In Vim, count is a long, which is *usually* 32 bits,
     // so will flip at 2147483648. We store count as an Int, which is also 32 bit.
     // See https://github.com/vim/vim/blob/b376ace1aeaa7614debc725487d75c8f756dd773/src/normal.c#L631
-    if (count < 0) {
-      count = 999999999
+    if (currentCount < 0) {
+      currentCount = 999999999
     }
     addKey(key)
   }
 
   fun deleteCountCharacter() {
-    count /= 10
+    currentCount /= 10
     keyList.removeAt(keyList.size - 1)
   }
 
-  fun setCurrentCommandPartNode(newNode: CommandPartNode<LazyVimCommand>) {
-    logger.trace { "setCurrentCommandPartNode is executed" }
-    currentCommandPartNode = newNode
+  var isRegisterPending: Boolean = false
+    private set
+
+  fun startWaitingForRegister(key: KeyStroke) {
+    isRegisterPending = true
+    addKey(key)
   }
 
-  fun getChildNode(key: KeyStroke): Node<LazyVimCommand>? {
-    return currentCommandPartNode[key]
+  fun selectRegister(register: Char) {
+    logger.trace { "Selected register '$register'" }
+    selectedRegister = register
+    isRegisterPending = false
+    fallbackArgumentType = null
+    counts.add(0)
   }
 
-  fun isAwaitingCharOrDigraphArgument(): Boolean {
-    val awaiting = expectedArgumentType == Argument.Type.CHARACTER || expectedArgumentType == Argument.Type.DIGRAPH
-    logger.debug { "Awaiting char or digraph: $awaiting" }
-    return awaiting
+  /**
+   * Adds a keystroke to the command builder
+   *
+   * Only public use is when entering a digraph/literal, where each key isn't handled by [CommandBuilder], but should
+   * be added to the `'showcmd'` output.
+   */
+  fun addKey(key: KeyStroke) {
+    logger.trace { "added key to command builder: $key" }
+    keyList.add(key)
+  }
+
+  /**
+   * Add an action to the command
+   *
+   * This can be an action such as delete the current character - `x`, a motion like `w`, an operator like `d` or a
+   * motion that will be used as the argument of an operator - the `w` in `dw`.
+   */
+  fun addAction(action: EditorActionHandlerBase) {
+    logger.trace { "addAction is executed. action = $action" }
+
+    if (this.action == null) {
+      this.action = action
+    }
+    else {
+      StrictMode.assert(argument == null, "Command builder already has an action and a fully populated argument")
+      argument = when (action) {
+        is MotionActionHandler -> Argument.Motion(action, null)
+        is TextObjectActionHandler -> Argument.Motion(action)
+        is ExternalActionHandler -> Argument.Motion(action)
+        else -> throw RuntimeException("Unexpected action type: $action")
+      }
+    }
+
+    // Push a new count component, so we get an extra count for e.g. an operator's motion
+    counts.add(0)
+    fallbackArgumentType = null
+
+    if (!isAwaitingArgument) {
+      logger.trace("Action does not require an argument. Setting command state to READY")
+      commandState = CurrentCommandState.READY
+    }
+  }
+
+  /**
+   * Add an argument to the command
+   *
+   * This might be a simple character argument, such as `x` in `fx`, or an ex-string argument to a search motion, like
+   * `d/foo`. If the command is an operator+motion, the motion is both an action and an argument. While it is simpler
+   * to use [addAction], it will still work if the motion action can also be wrapped in an [Argument.Motion] and passed
+   * to [addArgument].
+   */
+  fun addArgument(argument: Argument) {
+    logger.trace("addArgument is executed")
+
+    // If the command's action is an operator, the argument will be a motion, which might be waiting for its argument.
+    // If so, update the motion argument to include the given argument
+    this.argument = motionArgument?.withArgument(argument) ?: argument
+
+    fallbackArgumentType = null
+
+    if (!isAwaitingArgument) {
+      logger.trace("Argument is simple type, or motion with own argument. No further argument required. Setting command state to READY")
+      commandState = CurrentCommandState.READY
+    }
+  }
+
+  /**
+   * Process a keystroke, matching an action if available
+   *
+   * If the given keystroke matches an action, the [processor] is invoked with the action instance. Typically, the
+   * caller will end up passing the action back to [addAction], but there are more housekeeping steps that stop us
+   * encapsulating it completely.
+   *
+   * If the given keystroke does not yet match an action, the internal state is updated to track the current command
+   * part node.
+   */
+  fun processKey(key: KeyStroke, processor: (EditorActionHandlerBase) -> Unit): Boolean {
+    val node = currentCommandPartNode[key]
+    when (node) {
+      is CommandNode -> {
+        logger.trace { "Found full command node ($key) - ${node.debugString}" }
+        addKey(key)
+        processor(node.actionHolder.instance)
+        return true
+      }
+      is CommandPartNode -> {
+        logger.trace { "Found command part node ($key) - ${node.debugString}" }
+        currentCommandPartNode = node
+        addKey(key)
+        return true
+      }
+    }
+
+    logger.trace { "No command/command part node found for key: $key" }
+    return false
+  }
+
+  /**
+   * Map a keystroke that duplicates an operator into the `_` "current line" motion
+   *
+   * Some commands like `dd` or `yy` or `cc` are treated as special cases by Vim. There is no `d`, `y` or `c` motion,
+   * so for convenience, Vim maps the repeated operator keystroke as meaning "operate on the current line", and replaces
+   * the second keystroke with the `_` motion. I.e. `dd` becomes `d_`, `yy` becomes `y_`, `cc` becomes `c_`, etc.
+   *
+   * @see DuplicableOperatorAction
+   */
+  fun convertDuplicateOperatorKeyStrokeToMotion(key: KeyStroke): KeyStroke {
+    logger.trace { "convertDuplicateOperatorKeyStrokeToMotion is executed. key = $key" }
+
+    // Simple check to ensure that we're in OP_PENDING. If we don't have an action, we don't have an operator. If we
+    // have an argument, we can't be in OP_PENDING
+    if (action != null && argument == null) {
+      (action as? DuplicableOperatorAction)?.let {
+        logger.trace { "action = $action" }
+        if (it.duplicateWith == key.keyChar) {
+          return KeyStroke.getKeyStroke('_')
+        }
+      }
+    }
+    return key
   }
 
   fun isBuildingMultiKeyCommand(): Boolean {
@@ -178,67 +324,47 @@ class CommandBuilder(
     return isMultikey
   }
 
-  fun isDone(): Boolean {
-    return commandParts.isEmpty()
-  }
-
-  fun completeCommandPart(argument: Argument) {
-    logger.trace { "completeCommandPart is executed" }
-    commandParts.last().argument = argument
-    commandState = CurrentCommandState.READY
-  }
-
-  fun isDuplicateOperatorKeyStroke(key: KeyStroke): Boolean {
-    logger.trace { "entered isDuplicateOperatorKeyStroke" }
-    val action = commandParts.last().action as? DuplicableOperatorAction
-    logger.trace { "action = $action" }
-    return action?.duplicateWith == key.keyChar
-  }
-
-  fun hasCurrentCommandPartArgument(): Boolean {
-    return commandParts.lastOrNull()?.argument != null
-  }
-
+  /**
+   * Build the command with the current counts, register, actions and arguments
+   *
+   * The command builder is reset after the command is built.
+   */
   fun buildCommand(): Command {
-    var command: Command = commandParts.removeFirst()
-    while (commandParts.size > 0) {
-      val next = commandParts.removeFirst()
-      next.rawCount = if (command.rawCount == 0 && next.rawCount == 0) 0 else command.count * next.count
-      command.rawCount = 0
-      if (command.type == Command.Type.SELECT_REGISTER) {
-        next.register = command.register
-        command.register = null
-        command = next
-      } else {
-        command.argument = Argument(next)
-        assert(commandParts.size == 0)
-      }
-    }
-    fallbackArgumentType = null
+    val rawCount = calculateCount0Snapshot()
+    val command = Command(selectedRegister, rawCount, action!!, argument, action!!.type, action?.flags ?: noneOfEnum())
+    resetAll(currentCommandPartNode.root as RootNode<LazyVimCommand>)
     return command
   }
 
-  fun resetAll(commandPartNode: CommandPartNode<LazyVimCommand>) {
-    logger.trace { "resetAll is executed" }
-    resetInProgressCommandPart(commandPartNode)
+  fun resetAll(rootNode: RootNode<LazyVimCommand>) {
+    logger.trace("resetAll is executed")
+    currentCommandPartNode = rootNode
     commandState = CurrentCommandState.NEW_COMMAND
-    commandParts.clear()
+    counts.clear()
+    counts.add(0)
+    isRegisterPending = false
+    selectedRegister = null
+    action = null
+    argument = null
     keyList.clear()
     fallbackArgumentType = null
   }
 
-  fun resetCount() {
-    count = 0
-  }
-
-  fun resetInProgressCommandPart(commandPartNode: CommandPartNode<LazyVimCommand>) {
-    logger.trace { "resetInProgressCommandPart is executed" }
-    count = 0
-    setCurrentCommandPartNode(commandPartNode)
+  /**
+   * Change the command trie root node used to find commands for the current mode
+   *
+   * Typically, we reset the command trie root node after a command is executed, using the root node of the current
+   * mode - this is handled by [resetAll]. This function allows us to change the root node without executing a command
+   * or fully resetting the command builder, such as when switching to Op-pending while entering an operator+motion.
+   */
+  fun resetCommandTrieRootNode(rootNode: RootNode<LazyVimCommand>) {
+    logger.trace("resetCommandTrieRootNode is executed")
+    currentCommandPartNode = rootNode
   }
 
   @TestOnly
   fun getCurrentTrie(): CommandPartNode<LazyVimCommand> = currentCommandPartNode
+
   override fun equals(other: Any?): Boolean {
     if (this === other) return true
     if (javaClass != other?.javaClass) return false
@@ -246,10 +372,12 @@ class CommandBuilder(
     other as CommandBuilder
 
     if (currentCommandPartNode != other.currentCommandPartNode) return false
-    if (commandParts != other.commandParts) return false
+    if (counts != other.counts) return false
+    if (selectedRegister != other.selectedRegister) return false
+    if (action != other.action) return false
+    if (argument != other.argument) return false
     if (keyList != other.keyList) return false
     if (commandState != other.commandState) return false
-    if (count != other.count) return false
     if (expectedArgumentType != other.expectedArgumentType) return false
     if (fallbackArgumentType != other.fallbackArgumentType) return false
 
@@ -258,24 +386,38 @@ class CommandBuilder(
 
   override fun hashCode(): Int {
     var result = currentCommandPartNode.hashCode()
-    result = 31 * result + commandParts.hashCode()
+    result = 31 * result + counts.hashCode()
+    result = 31 * result + selectedRegister.hashCode()
+    result = 31 * result + action.hashCode()
+    result = 31 * result + argument.hashCode()
     result = 31 * result + keyList.hashCode()
     result = 31 * result + commandState.hashCode()
-    result = 31 * result + count
-    result = 31 * result + (expectedArgumentType?.hashCode() ?: 0)
-    result = 31 * result + (fallbackArgumentType?.hashCode() ?: 0)
+    result = 31 * result + expectedArgumentType.hashCode()
+    result = 31 * result + fallbackArgumentType.hashCode()
     return result
   }
 
   public override fun clone(): CommandBuilder {
-    val result = CommandBuilder(currentCommandPartNode, ArrayDeque(commandParts), keyList.toMutableList(), count)
+    val result = CommandBuilder(
+      currentCommandPartNode,
+      counts.toMutableList(),
+      keyList.toMutableList()
+    )
+    result.selectedRegister = selectedRegister
+    result.action = action
+    result.argument = argument
     result.commandState = commandState
     result.fallbackArgumentType = fallbackArgumentType
     return result
   }
 
   override fun toString(): String {
-    return "Command state = $commandState, key list = ${ injector.parser.toKeyNotation(keyList) }, command parts = ${ commandParts }, count = $count\n" +
+    return "Command state = $commandState, " +
+      "key list = ${ injector.parser.toKeyNotation(keyList) }, " +
+      "selected register = $selectedRegister, " +
+      "counts = $counts, " +
+      "action = $action, " +
+      "argument = $argument, " +
       "command part node - $currentCommandPartNode"
   }
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/CommandFlags.kt

@@ -68,11 +68,6 @@ enum class CommandFlags {
    */
   FLAG_EXPECT_MORE,
 
-  /**
-   * Indicate that the character argument may come from a digraph
-   */
-  FLAG_ALLOW_DIGRAPH,
-
   FLAG_START_EX,
   FLAG_END_EX,
 

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/MappingProcessor.kt

@@ -42,12 +42,12 @@ object MappingProcessor: KeyConsumer {
     val keyState = keyProcessResultBuilder.state
     val mappingState = keyState.mappingState
     val commandBuilder = keyState.commandBuilder
-    if (commandBuilder.isAwaitingCharOrDigraphArgument() ||
-      commandBuilder.isBuildingMultiKeyCommand() ||
-      isMappingDisabledForKey(key, keyState) ||
-      injector.vimState.isRegisterPending
+    if (commandBuilder.isAwaitingCharOrDigraphArgument()
+      || commandBuilder.isBuildingMultiKeyCommand()
+      || commandBuilder.isRegisterPending
+      || isMappingDisabledForKey(key, keyState)
     ) {
-      log.debug("Finish key processing, returning false")
+      log.debug("Mapping not applicable. Finish key processing, returning false")
       return false
     }
     mappingState.stopMappingTimer()
@@ -74,7 +74,7 @@ object MappingProcessor: KeyConsumer {
     // "0" can be mapped, but the mapping isn't applied when entering a count. Other digits are always mapped, even when
     // entering a count.
     // See `:help :map-modes`
-    val isMappingDisabled = key.keyChar == '0' && keyState.commandBuilder.count > 0
+    val isMappingDisabled = key.keyChar == '0' && keyState.commandBuilder.hasCountCharacters()
     log.debug { "Mapping disabled for key: $isMappingDisabled" }
     return isMappingDisabled
   }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/command/OperatorArguments.kt

@@ -8,21 +8,53 @@
 
 package com.maddyhome.idea.vim.command
 
+import com.maddyhome.idea.vim.api.VimEditor
 import com.maddyhome.idea.vim.state.mode.Mode
 
 /**
- * [count0] is a raw count entered by user. May be zero.
- * [count1] is the same count, but 1-based. If [count0] is zero, [count1] is one.
- * The terminology is taken directly from vim.
- * If no count is provided, [count0] defaults to zero.
+ * Represents arguments used when executing a command - either an action, operator or motion
+ *
+ * TODO: Remove, rename or otherwise refactor this class
+ *
+ * Problems with this class:
+ * * The name is misleading, as it is used when executing motions that do not have an operator, as well as when
+ *   executing the operator itself. Or even when executing actions that are neither operators nor motions
+ * * It is not clear if this represents the arguments to an operator (while the operator's [Command] also has arguments)
+ * * [mode] is the mode _before_ the command is completed, which is not guaranteed to be the same as the mode once the
+ *   command completes. There is no indication of this difference, which could lead to confusion
+ * * The count is (correctly) the count for the whole command, rather than the operator, or the operator's arguments
+ *   (the in-progress motion)
+ *
+ * @param isOperatorPending Deprecated. The value is used to indicate that a command is operator+motion and was
+ * previously used to change the behaviour of the motion (the EOL character is counted in this scenario - see
+ * `:help whichwrap`). It is better to register a separate action for [Mode.OP_PENDING] rather than expect a runtime
+ * flag for something that can be handled statically.
+ * @param count0 The raw count of the entire command. E.g., if the command is `2d3w`, then this count will be `6`, even
+ * when this class is passed to the `d` operator action (the count applies to the motion).
+ * @param mode Deprecated. The mode of the editor at the time that the [OperatorArguments] is created, which is _before_
+ * the command is completed. This was previously used to check for [Mode.OP_PENDING], but is no longer required. Prefer
+ * [VimEditor.mode] instead.
  */
-data class OperatorArguments(
-  val isOperatorPending: Boolean,
+data class OperatorArguments
+
+@Deprecated(
+  "Use overload without isOperatorPending. Value can be calculated from mode",
+  replaceWith = ReplaceWith("OperatorArguments(count0, mode)"),
+) constructor(
+  // This is used by EasyMotion
+  @Deprecated("It is better to register a separate OP_PENDING action than switch on a runtime flag") val isOperatorPending: Boolean,
   val count0: Int,
-
-  val mode: Mode,
+  @Deprecated("Represents the mode when the OperatorArguments was created, not the current mode. Prefer editor.mode") val mode: Mode,
 ) {
-  val count1: Int = count0.coerceAtLeast(1)
 
-  fun withCount0(count0: Int): OperatorArguments = this.copy(count0 = count0)
+  /**
+   * Create a new instance of [OperatorArguments]
+   *
+   * @param count0  The 0-based count for the whole command
+   * @param mode    Only used for the deprecated [OperatorArguments.mode] property
+   */
+  @Suppress("DEPRECATION")
+  constructor(count0: Int, mode: Mode) : this(mode is Mode.OP_PENDING, count0, mode)
+
+  val count1: Int = count0.coerceAtLeast(1)
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/common/CurrentCommandState.kt

@@ -11,5 +11,4 @@ package com.maddyhome.idea.vim.common
 enum class CurrentCommandState {
   NEW_COMMAND,
   READY,
-  BAD_COMMAND,
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/common/VimEditorReplaceMask.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2003-2024 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package com.maddyhome.idea.vim.common
+
+import com.maddyhome.idea.vim.api.VimEditor
+import com.maddyhome.idea.vim.api.injector
+
+class VimEditorReplaceMask {
+  private val changedChars = mutableMapOf<LiveRange, Char>()
+
+  fun recordChangeAtCaret(editor: VimEditor) {
+    for (caret in editor.carets()) {
+      val offset = caret.offset
+      val marker = editor.createLiveMarker(offset, offset)
+      changedChars[marker] = editor.charAt(offset)
+    }
+  }
+
+  fun popChange(editor: VimEditor, offset: Int): Char? {
+    val marker = editor.createLiveMarker(offset, offset)
+    val change = changedChars[marker]
+    changedChars.remove(marker)
+    return change
+  }
+}
+
+fun forgetAllReplaceMasks() {
+  injector.editorGroup.getEditors().forEach { it.replaceMask = null }
+}