Create an API for picking which screen notifications are displayed on (WIP)

Closes #357

.gitignore

@@ -12,6 +12,7 @@ bld/*
 # Rider
 **/.idea/dictionaries
 **/.idea/misc.xml
+**/.idea/riderMarkupCache.xml
 
 # User-specific files
 *.suo

.idea/.idea.TweetDuck/.idea/runConfigurations/TweetDuck.xml

@@ -11,8 +11,8 @@
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
-    <option name="PROJECT_KIND" value="Console" />
+    <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value=".NETFramework,Version=v4.7.2" />
+    <option name="PROJECT_TFM" value="net7.0-windows" />
     <method v="2">
       <option name="Build" />
     </method>

README.md

@@ -43,14 +43,14 @@ Download links and system requirements are on the [official website](https://twe
 
 Building TweetDuck for Windows requires at minimum [Visual Studio 2019](https://visualstudio.microsoft.com/downloads) and Windows 7. Before opening the solution, open Visual Studio Installer and make sure you have the following Visual Studio workloads and components installed:
 * **.NET desktop development**
-  * .NET Framework 4.7.2 targeting pack
+  * .NET SDK
   * F# desktop language support
 * **Desktop development with C++**
   * MSVC v142 - VS 2019 C++ x64/x86 build tools (v14.20 / Latest)
 
-In the **Installation details** panel, you can expand the workloads you selected, and uncheck any components that are not listed above to save space.
+In the **Installation details** panel, you can expand the workloads you selected, and uncheck any components that are not listed above to save space. You may uncheck the .NET SDK component if you installed the [.NET 6 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/6.0) directly.
 
-Building TweetDuck for Linux requires [.NET 5](https://docs.microsoft.com/en-us/dotnet/core/install/linux). The Linux project has its own solution file in the `linux/` folder.
+Building TweetDuck for Linux requires [.NET 6 SDK](https://docs.microsoft.com/en-us/dotnet/core/install/linux). The Linux project has its own solution file in the `linux/` folder.
 
 ### Editors
 
@@ -66,15 +66,15 @@ Icons and logos were designed in [Affinity Designer](https://affinity.serif.com/
 > If you don't want to build installers using the existing foundations, you can skip this section.
 
 Official Windows installers are built using [InnoSetup](https://jrsoftware.org/isinfo.php) and [Inno Download Plugin](https://mitrichsoftware.wordpress.com/inno-setup-tools/inno-download-plugin/), specifically:
-* [InnoSetup 5.6.1](https://files.jrsoftware.org/is/5/innosetup-5.6.1.exe) with Preprocessor support
+* [InnoSetup 6.2.1](https://files.jrsoftware.org/is/6/innosetup-6.2.1.exe)
-* [Inno Download Plugin 1.5.0](https://drive.google.com/folderview?id=0Bzw1xBVt0mokSXZrUEFIanV4azA&usp=sharing#list)
+* [Inno Download Plugin 1.5.1](https://drive.google.com/folderview?id=0Bzw1xBVt0mokSXZrUEFIanV4azA&usp=sharing#list)
 
-When installing InnoSetup, you can choose to include Inno Script Studio which I recommend for editing and testing installer configuration files in the `bld` folder (`.iss` extension).
+During installation, the download plugin will ask whether to add its include path to `ISPPBuiltins.iss`. Note that this option does not work with InnoSetup 6, so TweetDuck installers don't need it.
 
 Scripts for building installers require the `PATH` environment variable to include the InnoSetup installation folder. You can either edit `PATH` manually, or use a program like [Rapid Environment Editor](https://www.rapidee.com/en/about) to simplify the process. For example, this is the installation folder I added to `PATH` under **User variables**:
-* `C:\Program Files (x86)\Inno Setup 5`
+* `C:\Program Files (x86)\Inno Setup 6`
 
-You may need to restart Visual Studio after changing `PATH` for the change to take place.
+You may need to restart Visual Studio or Rider after changing `PATH` for the change to take place.
 
 ## Solution Overview
 
@@ -84,13 +84,13 @@ On Windows, TweetDuck uses the [CefSharp](https://github.com/cefsharp/CefSharp/)
 
 On Linux, TweetDuck uses the [ChromiumGtk](https://github.com/lunixo/ChromiumGtk) library, which combines [CefGlue](https://gitlab.com/xiliumhq/chromiumembedded/cefglue) for the browser component and [GtkSharp](https://github.com/GtkSharp/GtkSharp) for the GUI.
 
-The solution contains several C# projects for executables and libraries, and F# projects for automated tests.
+The solution contains several C# projects for executables and libraries, and F# projects for automated tests. All projects target `.NET 6` and either `C# 10` or `F#`.
 
 Projects are organized into folders:
-* Windows projects are in the `windows/` folder, and target `.NET Framework 4.7.2` + `C# 8.0`
+* Windows projects are in the `windows/` folder
-* Linux projects are in the `linux/` folder, and target `.NET 5` + `C#`
+* Linux projects are in the `linux/` folder
-* Libraries (`TweetLib.*`) are in the `lib/` folder, and target `.NET Standard 2.0` + `C# 9.0`
+* Libraries (`TweetLib.*`) are in the `lib/` folder
-* Tests (`TweetTest.*`) are also in the `lib/` folder, and target `.NET Framework 4.7.2` + `F#`
+* Tests (`TweetTest.*`) are also in the `lib/` folder
 
 Here are a few things to keep in mind:
 * Executable projects have their entry points in `Program.cs`
@@ -130,7 +130,7 @@ Main Windows executable. It has a dependency on [CefSharp](https://github.com/ce
 
 #### TweetDuck.Browser
 
-Windows executable that hosts various Chromium processes. It depends on two specific DLLs from the [CefSharp](https://github.com/cefsharp/CefSharp/) package. After updating [CefSharp](https://github.com/cefsharp/CefSharp/), run the `windows/TweetDuck/Resources/PostCefUpdate.ps1` PowerShell script to update these dependencies to the new version.
+Windows executable that hosts various Chromium processes. It has a dependency on [CefSharp](https://github.com/cefsharp/CefSharp/).
 
 #### TweetDuck.Video
 
@@ -142,6 +142,10 @@ By default, [CefSharp](https://github.com/cefsharp/CefSharp/) is not built with
 
 Windows library that implements `TweetLib.Browser.CEF` using the [CefSharp](https://github.com/cefsharp/CefSharp/) library and Windows Forms.
 
+#### TweetLib.WinForms.Legacy
+
+Windows library that re-adds some legacy Windows Forms components that were removed in .NET Core 3.1. The sources were taken from the [.NET Core 3.0 sources of Windows Forms](https://github.com/dotnet/winforms/tree/v3.0.2), and edited to remove unnecessary features.
+
 ### Linux Projects
 
 #### TweetDuck

TweetDuck.sln

@@ -10,6 +10,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetDuck.Video", "windows\
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetImpl.CefSharp", "windows\TweetImpl.CefSharp\TweetImpl.CefSharp.csproj", "{44DF3E2E-F465-4A31-8B43-F40FFFB018BA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetLib.WinForms.Legacy", "windows\TweetLib.WinForms.Legacy\TweetLib.WinForms.Legacy.csproj", "{B54E732A-4090-4DAA-9ABD-311368C17B68}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetLib.Api", "lib\TweetLib.Api\TweetLib.Api.csproj", "{85596C10-F76E-4619-9CC6-6C1593880F83}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetLib.Communication", "lib\TweetLib.Communication\TweetLib.Communication.csproj", "{72473763-4B9D-4FB6-A923-9364B2680F06}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TweetLib.Core", "lib\TweetLib.Core\TweetLib.Core.csproj", "{93BA3CB4-A812-4949-B07D-8D393FB38937}"
@@ -48,6 +52,14 @@ Global
 		{44DF3E2E-F465-4A31-8B43-F40FFFB018BA}.Debug|x86.Build.0 = Debug|x86
 		{44DF3E2E-F465-4A31-8B43-F40FFFB018BA}.Release|x86.ActiveCfg = Release|x86
 		{44DF3E2E-F465-4A31-8B43-F40FFFB018BA}.Release|x86.Build.0 = Release|x86
+		{B54E732A-4090-4DAA-9ABD-311368C17B68}.Debug|x86.ActiveCfg = Debug|x86
+		{B54E732A-4090-4DAA-9ABD-311368C17B68}.Debug|x86.Build.0 = Debug|x86
+		{B54E732A-4090-4DAA-9ABD-311368C17B68}.Release|x86.ActiveCfg = Release|x86
+		{B54E732A-4090-4DAA-9ABD-311368C17B68}.Release|x86.Build.0 = Release|x86
+		{85596C10-F76E-4619-9CC6-6C1593880F83}.Debug|x86.ActiveCfg = Debug|x86
+		{85596C10-F76E-4619-9CC6-6C1593880F83}.Debug|x86.Build.0 = Debug|x86
+		{85596C10-F76E-4619-9CC6-6C1593880F83}.Release|x86.ActiveCfg = Release|x86
+		{85596C10-F76E-4619-9CC6-6C1593880F83}.Release|x86.Build.0 = Release|x86
 		{72473763-4B9D-4FB6-A923-9364B2680F06}.Debug|x86.ActiveCfg = Debug|x86
 		{72473763-4B9D-4FB6-A923-9364B2680F06}.Debug|x86.Build.0 = Debug|x86
 		{72473763-4B9D-4FB6-A923-9364B2680F06}.Release|x86.ActiveCfg = Release|x86

Version.cs

@@ -6,6 +6,6 @@ using TweetDuck;
 
 namespace TweetDuck {
 	internal static class Version {
-		public const string Tag = "1.22.1";
+		public const string Tag = "1.25.4";
 	}
 }

bld/gen_full.iss

@@ -1,16 +1,21 @@
 ; Script generated by the Inno Script Studio Wizard.
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
+#define MyAppID "8C25A716-7E11-4AAD-9992-8B5D0C78AE06"
+
 #define MyAppName "TweetDuck"
 #define MyAppPublisher "chylex"
 #define MyAppURL "https://tweetduck.chylex.com"
 #define MyAppShortURL "https://td.chylex.com"
 #define MyAppExeName "TweetDuck.exe"
 
-#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\x86\Release\TweetDuck.exe")
+#define MyAppArchitecture "x86"
+#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\" + MyAppArchitecture + "\Release\TweetDuck.exe")
+
+#include ReadReg(HKLM, "Software\Mitrich Software\Inno Download Plugin", "InstallDir") + "\idp.iss"
 
 [Setup]
-AppId={{8C25A716-7E11-4AAD-9992-8B5D0C78AE06}
+AppId={{{#MyAppID}}
 AppName={#MyAppName}
 AppVersion={#MyAppVersion}
 AppVerName={#MyAppName} {#MyAppVersion}
@@ -29,13 +34,11 @@ Uninstallable=TDIsUninstallable
 UninstallDisplayName={#MyAppName}
 UninstallDisplayIcon={app}\{#MyAppExeName}
 Compression=lzma2/ultra
-LZMADictionarySize=15360
+LZMADictionarySize=32768
 SolidCompression=yes
 InternalCompressLevel=normal
 MinVersion=0,6.1
 
-#include <idp.iss>
-
 [Languages]
 Name: "english"; MessagesFile: "compiler:Default.isl"
 
@@ -43,8 +46,8 @@ Name: "english"; MessagesFile: "compiler:Default.isl"
 Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalTasks}"; Flags: unchecked
 
 [Files]
-Source: "..\windows\TweetDuck\bin\x86\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
 
 [Icons]
 Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Check: TDIsUninstallable
@@ -68,20 +71,11 @@ AdditionalTasks=Additional shortcuts and components:
 var UpdatePath: String;
 var VisitedTasksPage: Boolean;
 
-function TDGetNetFrameworkVersion: Cardinal; forward;
+{ Prepare installation variables. }
-
-{ Check .NET Framework version on startup, ask user if they want to proceed if older than 4.7.2. }
 function InitializeSetup: Boolean;
 begin
   UpdatePath := ExpandConstant('{param:UPDATEPATH}')
   VisitedTasksPage := False
-  
-  if (TDGetNetFrameworkVersion() < 461808) and (MsgBox('{#MyAppName} requires .NET Framework 4.7.2 or newer,'+#13+#10+'please visit {#MyAppShortURL} for a download link.'+#13+#10+#13+#10'Do you want to proceed with the setup anyway?', mbCriticalError, MB_YESNO or MB_DEFBUTTON2) = IDNO) then
-  begin
-    Result := False
-    Exit
-  end;
-  
   Result := True
 end;
 
@@ -140,17 +134,3 @@ function TDIsUninstallable: Boolean;
 begin
   Result := (UpdatePath = '')
 end;
-
-{ Return DWORD value containing the build version of .NET Framework. }
-function TDGetNetFrameworkVersion: Cardinal;
-var FrameworkVersion: Cardinal;
-
-begin
-  if RegQueryDWordValue(HKEY_LOCAL_MACHINE, 'Software\Microsoft\NET Framework Setup\NDP\v4\Full', 'Release', FrameworkVersion) then
-  begin
-    Result := FrameworkVersion
-    Exit
-  end;
-  
-  Result := 0
-end;

bld/gen_port.iss

@@ -1,16 +1,21 @@
 ; Script generated by the Inno Script Studio Wizard.
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
+#define MyAppID "8C25A716-7E11-4AAD-9992-8B5D0C78AE06"
+
 #define MyAppName "TweetDuck"
 #define MyAppPublisher "chylex"
 #define MyAppURL "https://tweetduck.chylex.com"
 #define MyAppShortURL "https://td.chylex.com"
 #define MyAppExeName "TweetDuck.exe"
 
-#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\x86\Release\TweetDuck.exe")
+#define MyAppArchitecture "x86"
+#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\" + MyAppArchitecture + "\Release\TweetDuck.exe")
+
+#include ReadReg(HKLM, "Software\Mitrich Software\Inno Download Plugin", "InstallDir") + "\idp.iss"
 
 [Setup]
-AppId={{8C25A716-7E11-4AAD-9992-8B5D0C78AE06}
+AppId={{{#MyAppID}}
 AppName={#MyAppName} Portable
 AppVersion={#MyAppVersion}
 AppVerName={#MyAppName} {#MyAppVersion}
@@ -29,19 +34,17 @@ Uninstallable=no
 UsePreviousAppDir=no
 PrivilegesRequired=lowest
 Compression=lzma2/ultra
-LZMADictionarySize=15360
+LZMADictionarySize=32768
 SolidCompression=yes
 InternalCompressLevel=normal
 MinVersion=0,6.1
 
-#include <idp.iss>
-
 [Languages]
 Name: "english"; MessagesFile: "compiler:Default.isl"
 
 [Files]
-Source: "..\windows\TweetDuck\bin\x86\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
 
 [Run]
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall shellexec skipifsilent
@@ -52,19 +55,10 @@ AdditionalTasks=Additional components:
 [Code]
 var UpdatePath: String;
 
-function TDGetNetFrameworkVersion: Cardinal; forward;
+{ Prepare installation variables. }
-
-{ Check .NET Framework version on startup, ask user if they want to proceed if older than 4.7.2. }
 function InitializeSetup: Boolean;
 begin
   UpdatePath := ExpandConstant('{param:UPDATEPATH}')
-  
-  if (TDGetNetFrameworkVersion() < 461808) and (MsgBox('{#MyAppName} requires .NET Framework 4.7.2 or newer,'+#13+#10+'please visit {#MyAppShortURL} for a download link.'+#13+#10+#13+#10'Do you want to proceed with the setup anyway?', mbCriticalError, MB_YESNO or MB_DEFBUTTON2) = IDNO) then
-  begin
-    Result := False
-    Exit
-  end;
-  
   Result := True
 end;
 
@@ -102,17 +96,3 @@ begin
     end;
   end;
 end;
-
-{ Return DWORD value containing the build version of .NET Framework. }
-function TDGetNetFrameworkVersion: Cardinal;
-var FrameworkVersion: Cardinal;
-
-begin
-  if RegQueryDWordValue(HKEY_LOCAL_MACHINE, 'Software\Microsoft\NET Framework Setup\NDP\v4\Full', 'Release', FrameworkVersion) then
-  begin
-    Result := FrameworkVersion
-    Exit
-  end;
-  
-  Result := 0
-end;

bld/gen_upd.iss

@@ -1,15 +1,19 @@
 ; Script generated by the Inno Script Studio Wizard.
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
+#define MyAppID "8C25A716-7E11-4AAD-9992-8B5D0C78AE06"
+
 #define MyAppName "TweetDuck"
 #define MyAppPublisher "chylex"
 #define MyAppURL "https://tweetduck.chylex.com"
 #define MyAppShortURL "https://td.chylex.com"
 #define MyAppExeName "TweetDuck.exe"
 
-#define MyAppID "8C25A716-7E11-4AAD-9992-8B5D0C78AE06"
+#define MyAppArchitecture "x86"
-#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\x86\Release\TweetDuck.exe")
+#define MyAppVersion GetFileVersion("..\windows\TweetDuck\bin\" + MyAppArchitecture + "\Release\TweetDuck.exe")
-#define CefVersion GetFileVersion("..\windows\TweetDuck\bin\x86\Release\libcef.dll")
+#define CefVersion GetFileVersion("..\windows\TweetDuck\bin\" + MyAppArchitecture + "\Release\libcef.dll")
+
+#include ReadReg(HKLM, "Software\Mitrich Software\Inno Download Plugin", "InstallDir") + "\idp.iss"
 
 [Setup]
 AppId={{{#MyAppID}}
@@ -37,19 +41,17 @@ SolidCompression=True
 InternalCompressLevel=normal
 MinVersion=0,6.1
 
-#include <idp.iss>
-
 [Languages]
 Name: "english"; MessagesFile: "compiler:Default.isl"
 
 [Files]
-Source: "..\windows\TweetDuck\bin\x86\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\TweetDuck.*"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\TweetDuck.*"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\TweetImpl.*"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\TweetImpl.*"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\TweetLib.*"; DestDir: "{app}"; Flags: ignoreversion
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\TweetLib.*"; DestDir: "{app}"; Flags: ignoreversion
-Source: "..\windows\TweetDuck\bin\x86\Release\guide\*.*"; DestDir: "{app}\guide"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\guide\*.*"; DestDir: "{app}\guide"; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: "..\windows\TweetDuck\bin\x86\Release\resources\*.*"; DestDir: "{app}\resources"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\resources\*.*"; DestDir: "{app}\resources"; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: "..\windows\TweetDuck\bin\x86\Release\plugins\*.*"; DestDir: "{app}\plugins"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "..\windows\TweetDuck\bin\{#MyAppArchitecture}\Release\plugins\*.*"; DestDir: "{app}\plugins"; Flags: ignoreversion recursesubdirs createallsubdirs
 
 [Icons]
 Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Check: TDIsUninstallable
@@ -69,22 +71,24 @@ Type: filesandordirs; Name: "{localappdata}\{#MyAppName}\GPUCache"
 Type: files; Name: "{app}\CEFSHARP-LICENSE.txt"
 Type: files; Name: "{app}\LICENSE.txt"
 Type: files; Name: "{app}\README.txt"
-Type: files; Name: "{app}\natives_blob.bin"
 Type: files; Name: "{app}\cef.pak"
 Type: files; Name: "{app}\cef_100_percent.pak"
 Type: files; Name: "{app}\cef_200_percent.pak"
 Type: files; Name: "{app}\cef_extensions.pak"
 Type: files; Name: "{app}\devtools_resources.pak"
+Type: files; Name: "{app}\natives_blob.bin"
+Type: files; Name: "{app}\dbgshim.dll"
+Type: files; Name: "{app}\mscordaccore_x86_x86_6.*.dll"
 Type: filesandordirs; Name: "{app}\guide"
 Type: filesandordirs; Name: "{app}\plugins\official"
 Type: filesandordirs; Name: "{app}\resources"
 Type: filesandordirs; Name: "{app}\scripts"
+Type: filesandordirs; Name: "{app}\swiftshader"
 
 [Code]
 function TDIsUninstallable: Boolean; forward;
 function TDGetRunArgs(Param: String): String; forward;
 function TDFindUpdatePath: String; forward;
-function TDGetNetFrameworkVersion: Cardinal; forward;
 function TDGetAppVersionClean: String; forward;
 function TDGetFullDownloadFileName: String; forward;
 function TDIsMatchingCEFVersion: Boolean; forward;
@@ -93,7 +97,7 @@ procedure TDExecuteFullDownload; forward;
 var IsPortable: Boolean;
 var UpdatePath: String;
 
-{ Check .NET Framework version on startup, ask user if they want to proceed if older than 4.7.2. Prepare full download package if required. }
+{ Prepare update installation, and the full download package if required. }
 function InitializeSetup: Boolean;
 begin
   IsPortable := ExpandConstant('{param:PORTABLE}') = '1'
@@ -111,12 +115,6 @@ begin
     idpAddFile('https://github.com/{#MyAppPublisher}/{#MyAppName}/releases/download/'+TDGetAppVersionClean()+'/'+TDGetFullDownloadFileName(), ExpandConstant('{tmp}\{#MyAppName}.Full.exe'))
   end;
   
-  if (TDGetNetFrameworkVersion() < 461808) and (MsgBox('{#MyAppName} requires .NET Framework 4.7.2 or newer,'+#13+#10+'please visit {#MyAppShortURL} for a download link.'+#13+#10+#13+#10'Do you want to proceed with the setup anyway?', mbCriticalError, MB_YESNO or MB_DEFBUTTON2) = IDNO) then
-  begin
-    Result := False
-    Exit
-  end;
-  
   Result := True
 end;
 
@@ -211,20 +209,6 @@ begin
   Result := Path
 end;
 
-{ Return DWORD value containing the build version of .NET Framework. }
-function TDGetNetFrameworkVersion: Cardinal;
-var FrameworkVersion: Cardinal;
-
-begin
-  if RegQueryDWordValue(HKEY_LOCAL_MACHINE, 'Software\Microsoft\NET Framework Setup\NDP\v4\Full', 'Release', FrameworkVersion) then
-  begin
-    Result := FrameworkVersion
-    Exit
-  end;
-  
-  Result := 0
-end;
-
 { Return the name of the full installer file to download from GitHub. }
 function TDGetFullDownloadFileName: String;
 begin

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "7.0.0",
+    "rollForward": "latestMinor",
+    "allowPrerelease": false
+  }
+}

lib/TweetLib.Api/Data/NamespacedResource.cs

@@ -0,0 +1,37 @@
+namespace TweetLib.Api.Data {
+	public readonly struct NamespacedResource {
+		public Resource Namespace { get; }
+		public Resource Path { get; }
+
+		public NamespacedResource(Resource ns, Resource path) {
+			Namespace = ns;
+			Path = path;
+		}
+
+		private bool Equals(NamespacedResource other) {
+			return Namespace.Equals(other.Namespace) && Path.Equals(other.Path);
+		}
+
+		public override bool Equals(object? obj) {
+			return obj is NamespacedResource other && Equals(other);
+		}
+
+		public static bool operator ==(NamespacedResource left, NamespacedResource right) {
+			return left.Equals(right);
+		}
+
+		public static bool operator !=(NamespacedResource left, NamespacedResource right) {
+			return !left.Equals(right);
+		}
+
+		public override int GetHashCode() {
+			unchecked {
+				return (Namespace.GetHashCode() * 397) ^ Path.GetHashCode();
+			}
+		}
+
+		public override string ToString() {
+			return $"{Namespace}:{Path}";
+		}
+	}
+}

lib/TweetLib.Api/Data/Notification/IDesktopNotificationScreenProvider.cs

@@ -0,0 +1,28 @@
+namespace TweetLib.Api.Data.Notification {
+	/// <summary>
+	/// Allows extensions to decide which screen to use for notifications.
+	///
+	/// Every registered provider becomes available in the Options dialog and has to be explicitly selected by the user. Only one provider
+	/// can be active at any given time.
+	/// </summary>
+	public interface IDesktopNotificationScreenProvider {
+		/// <summary>
+		/// A unique identifier of this provider. Only needs to be unique within the scope of this plugin.
+		/// </summary>
+		Resource Id { get; }
+
+		/// <summary>
+		/// Text displayed in the user interface.
+		/// </summary>
+		string DisplayName { get; }
+
+		/// <summary>
+		/// Returns a screen that will be used to display the next desktop notification.
+		///
+		/// If the return value is <c>null</c> or a screen that is not present in <see cref="IScreenLayout.AllScreens" />, desktop
+		/// notifications will be temporarily paused and this method will be called again after an unspecified amount of time (but
+		/// not sooner than 1 second since the last call).
+		/// </summary>
+		IScreen? PickScreen(IScreenLayout layout);
+	}
+}

lib/TweetLib.Api/Data/Notification/IScreen.cs

@@ -0,0 +1,7 @@
+namespace TweetLib.Api.Data.Notification {
+	public interface IScreen {
+		ScreenBounds Bounds { get; }
+		string Name { get; }
+		bool IsPrimary { get; }
+	}
+}

lib/TweetLib.Api/Data/Notification/IScreenLayout.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace TweetLib.Api.Data.Notification {
+	public interface IScreenLayout {
+		IScreen PrimaryScreen { get; }
+		IScreen TweetDuckScreen { get; }
+		List<IScreen> AllScreens { get; }
+	}
+}

lib/TweetLib.Api/Data/Notification/ScreenBounds.cs

@@ -0,0 +1,18 @@
+namespace TweetLib.Api.Data.Notification {
+	public readonly struct ScreenBounds {
+		public int X1 { get; }
+		public int Y1 { get; }
+		public int Width { get; }
+		public int Height { get; }
+
+		public int X2 => X1 + Width;
+		public int Y2 => Y1 + Height;
+
+		public ScreenBounds(int x1, int y1, int width, int height) {
+			X1 = x1;
+			Y1 = y1;
+			Width = width;
+			Height = height;
+		}
+	}
+}

lib/TweetLib.Api/Data/Resource.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Text.RegularExpressions;
+
+namespace TweetLib.Api.Data {
+	public readonly struct Resource {
+		private const string ValidCharacterPattern = "^[a-z0-9_]+$";
+		private static readonly Regex ValidCharacterRegex = new Regex(ValidCharacterPattern, RegexOptions.Compiled);
+
+		public string Name { get; }
+
+		public Resource(string name) {
+			if (!ValidCharacterRegex.IsMatch(name)) {
+				throw new ArgumentException("Resource name must match the regex: " + ValidCharacterPattern);
+			}
+
+			Name = name;
+		}
+
+		private bool Equals(Resource other) {
+			return Name == other.Name;
+		}
+
+		public override bool Equals(object? obj) {
+			return obj is Resource other && Equals(other);
+		}
+
+		public static bool operator ==(Resource left, Resource right) {
+			return left.Equals(right);
+		}
+
+		public static bool operator !=(Resource left, Resource right) {
+			return !left.Equals(right);
+		}
+
+		public override int GetHashCode() {
+			return Name.GetHashCode();
+		}
+
+		public override string ToString() {
+			return Name;
+		}
+	}
+}

lib/TweetLib.Api/ITweetDuckApi.cs

@@ -0,0 +1,5 @@
+namespace TweetLib.Api {
+	public interface ITweetDuckApi {
+		T? FindService<T>() where T : class, ITweetDuckService;
+	}
+}

lib/TweetLib.Api/ITweetDuckService.cs

@@ -0,0 +1,3 @@
+namespace TweetLib.Api {
+	public interface ITweetDuckService {}
+}

lib/TweetLib.Api/Service/INotificationService.cs

@@ -0,0 +1,7 @@
+using TweetLib.Api.Data.Notification;
+
+namespace TweetLib.Api.Service {
+	public interface INotificationService : ITweetDuckService {
+		void RegisterDesktopNotificationScreenProvider(IDesktopNotificationScreenProvider provider);
+	}
+}

lib/TweetLib.Api/TweetDuckExtension.cs

@@ -0,0 +1,15 @@
+using TweetLib.Api.Data;
+
+namespace TweetLib.Api {
+	public abstract class TweetDuckExtension {
+		/// <summary>
+		/// Unique identifier of the extension.
+		/// </summary>
+		public abstract Resource Id { get; }
+
+		/// <summary>
+		/// Called when the extension is loaded on startup, or enabled at runtime.
+		/// </summary>
+		public abstract void Enable(ITweetDuckApi api);
+	}
+}

lib/TweetLib.Api/TweetLib.Api.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Configurations>Debug;Release</Configurations>
+    <Platforms>x86;x64</Platforms>
+    <LangVersion>10</LangVersion>
+    <Nullable>enable</Nullable>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <Compile Include="..\..\Version.cs" Link="Version.cs" />
+  </ItemGroup>
+
+</Project>

lib/TweetLib.Browser.CEF/Data/ContextMenuActionRegistry.cs

@@ -2,7 +2,7 @@ using System;
 using System.Collections.Generic;
 
 namespace TweetLib.Browser.CEF.Data {
-	abstract class ContextMenuActionRegistry<T> {
+	abstract class ContextMenuActionRegistry<T> where T : notnull {
 		private readonly Dictionary<T, Action> actions = new ();
 
 		protected abstract T NextId(int n);

lib/TweetLib.Browser.CEF/Data/ResourceHandlerRegistry.cs

@@ -21,7 +21,7 @@ namespace TweetLib.Browser.CEF.Data {
 		}
 
 		private void Register(string url, Func<TResourceHandler> factory) {
-			if (!Uri.TryCreate(url, UriKind.Absolute, out Uri uri)) {
+			if (!Uri.TryCreate(url, UriKind.Absolute, out var uri)) {
 				throw new ArgumentException("Resource handler URL must be absolute!");
 			}
 

lib/TweetLib.Browser.CEF/Logic/DialogHandlerLogic.cs

@@ -29,7 +29,7 @@ namespace TweetLib.Browser.CEF.Logic {
 				};
 
 				fileDialogOpener.OpenFile("Open Files", multiple, filters, files => {
-					string ext = Path.GetExtension(files[0])!.ToLower();
+					string ext = Path.GetExtension(files[0]).ToLower();
 					callbackAdapter.Continue(callback, Array.FindIndex(supportedExtensions, filter => ParseFileType(filter).Contains(ext)), files);
 					callbackAdapter.Dispose(callback);
 				}, () => {

lib/TweetLib.Browser.CEF/Logic/JsDialogHandlerLogic.cs

@@ -9,7 +9,7 @@ namespace TweetLib.Browser.CEF.Logic {
 			
 			int pipe = text.IndexOf('|');
 			if (pipe != -1) {
-				type = text.Substring(0, pipe) switch {
+				type = text[..pipe] switch {
 					"error"    => MessageDialogType.Error,
 					"warning"  => MessageDialogType.Warning,
 					"info"     => MessageDialogType.Information,
@@ -18,7 +18,7 @@ namespace TweetLib.Browser.CEF.Logic {
 				};
 
 				if (type != MessageDialogType.None) {
-					text = text.Substring(pipe + 1);
+					text = text[(pipe + 1)..];
 				}
 			}
 

lib/TweetLib.Browser.CEF/TweetLib.Browser.CEF.csproj

@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <Configurations>Debug;Release</Configurations>
     <Platforms>x86;x64</Platforms>
-    <LangVersion>9</LangVersion>
+    <LangVersion>11</LangVersion>
     <Nullable>enable</Nullable>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>

lib/TweetLib.Browser.CEF/Utils/CefUtils.cs

@@ -8,7 +8,7 @@ namespace TweetLib.Browser.CEF.Utils {
 			return Path.Combine(storagePath, "Cache");
 		}
 
-		public static CommandLineArgs ParseCommandLineArguments(string argumentString) {
+		public static CommandLineArgs ParseCommandLineArguments(string? argumentString) {
 			CommandLineArgs args = new CommandLineArgs();
 
 			if (string.IsNullOrWhiteSpace(argumentString)) {
@@ -26,8 +26,8 @@ namespace TweetLib.Browser.CEF.Utils {
 					value = "1";
 				}
 				else {
-					key = matchValue.Substring(0, indexEquals).TrimStart('-');
+					key = matchValue[..indexEquals].TrimStart('-');
-					value = matchValue.Substring(indexEquals + 1).Trim('"');
+					value = matchValue[(indexEquals + 1)..].Trim('"');
 				}
 
 				if (key.Length != 0) {

lib/TweetLib.Browser/Contexts/Notification.cs

@@ -1,9 +1,9 @@
 namespace TweetLib.Browser.Contexts {
 	public struct Notification {
-		public string TweetUrl { get; }
+		public string? TweetUrl { get; }
 		public string? QuoteUrl { get; }
 
-		public Notification(string tweetUrl, string? quoteUrl) {
+		public Notification(string? tweetUrl, string? quoteUrl) {
 			TweetUrl = tweetUrl;
 			QuoteUrl = quoteUrl;
 		}

lib/TweetLib.Browser/TweetLib.Browser.csproj

@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <Configurations>Debug;Release</Configurations>
     <Platforms>x86;x64</Platforms>
-    <LangVersion>9</LangVersion>
+    <LangVersion>11</LangVersion>
     <Nullable>enable</Nullable>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>

lib/TweetLib.Communication/Pipe/DuplexPipe.cs

@@ -13,13 +13,11 @@ namespace TweetLib.Communication.Pipe {
 
 		public static Client CreateClient(string token) {
 			int space = token.IndexOf(' ');
-			return new Client(token.Substring(0, space), token.Substring(space + 1));
+			return new Client(token[..space], token[(space + 1)..]);
 		}
 
 		private readonly PipeStream pipeIn;
 		private readonly PipeStream pipeOut;
-
-		private readonly Thread readerThread;
 		private readonly StreamWriter writerStream;
 
 		public event EventHandler<PipeReadEventArgs>? DataIn;
@@ -27,21 +25,20 @@ namespace TweetLib.Communication.Pipe {
 		private DuplexPipe(PipeStream pipeIn, PipeStream pipeOut) {
 			this.pipeIn = pipeIn;
 			this.pipeOut = pipeOut;
-
-			this.readerThread = new Thread(ReaderThread) {
-				IsBackground = true
-			};
-
-			this.readerThread.Start();
 			this.writerStream = new StreamWriter(this.pipeOut);
+
+			new Thread(ReaderThread) { IsBackground = true }.Start();
 		}
 
 		private void ReaderThread() {
 			using StreamReader read = new StreamReader(pipeIn);
-			string? data;
 
-			while ((data = read.ReadLine()) != null) {
+			try {
-				DataIn?.Invoke(this, new PipeReadEventArgs(data));
+				while (read.ReadLine() is {} data) {
+					DataIn?.Invoke(this, new PipeReadEventArgs(data));
+				}
+			} catch (ObjectDisposedException) {
+				// expected
 			}
 		}
 
@@ -56,12 +53,6 @@ namespace TweetLib.Communication.Pipe {
 		}
 
 		public void Dispose() {
-			try {
-				readerThread.Abort();
-			} catch {
-				// /shrug
-			}
-
 			pipeIn.Dispose();
 			writerStream.Dispose();
 		}
@@ -98,8 +89,8 @@ namespace TweetLib.Communication.Pipe {
 					Data = string.Empty;
 				}
 				else {
-					Key = line.Substring(0, separatorIndex);
+					Key = line[..separatorIndex];
-					Data = line.Substring(separatorIndex + 1);
+					Data = line[(separatorIndex + 1)..];
 				}
 			}
 		}

lib/TweetLib.Communication/TweetLib.Communication.csproj

@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <Platforms>x86</Platforms>
-    <LangVersion>9</LangVersion>
+    <LangVersion>11</LangVersion>
     <Nullable>enable</Nullable>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>

lib/TweetLib.Core/App.cs

@@ -5,6 +5,8 @@ using TweetLib.Browser.Request;
 using TweetLib.Core.Application;
 using TweetLib.Core.Features;
 using TweetLib.Core.Features.Plugins;
+using TweetLib.Core.Resources;
+using TweetLib.Core.Systems.Api;
 using TweetLib.Core.Systems.Configuration;
 using TweetLib.Core.Systems.Logging;
 using TweetLib.Utils.Static;
@@ -21,8 +23,11 @@ namespace TweetLib.Core {
 		internal static readonly string PluginPath    = Path.Combine(ProgramPath, "plugins");
 		internal static readonly string GuidePath     = Path.Combine(ProgramPath, "guide");
 
-		public static readonly string StoragePath = IsPortable ? Path.Combine(ProgramPath, "portable", "storage") : GetDataFolder();
+		public static readonly string ExtensionPath = Path.Combine(ProgramPath, "extensions");
-		public static readonly string LogoPath    = Path.Combine(ResourcesPath, "images/logo.png");
+		public static readonly string StoragePath   = IsPortable ? Path.Combine(ProgramPath, "portable", "storage") : GetDataFolder();
+		public static readonly string LogoPath      = Path.Combine(ResourcesPath, "images/logo.png");
+
+		public static ApiImplementation Api { get; } = new ();
 
 		public static Logger Logger               { get; } = new (Path.Combine(StoragePath, "TD_Log.txt"), Setup.IsDebugLogging);
 		public static ConfigManager ConfigManager { get; } = Setup.CreateConfigManager(StoragePath);
@@ -110,11 +115,11 @@ namespace TweetLib.Core {
 	}
 
 	public sealed class AppBuilder {
-		public IAppSetup? Setup { get; set; }
+		public IAppSetup? Setup { get; init; }
-		public IAppErrorHandler? ErrorHandler { get; set; }
+		public IAppErrorHandler? ErrorHandler { get; init; }
-		public IAppSystemHandler? SystemHandler { get; set; }
+		public IAppSystemHandler? SystemHandler { get; init; }
-		public IAppMessageDialogs? MessageDialogs { get; set; }
+		public IAppMessageDialogs? MessageDialogs { get; init; }
-		public IAppFileDialogs? FileDialogs { get; set; }
+		public IAppFileDialogs? FileDialogs { get; init; }
 
 		internal static AppBuilder? Instance { get; private set; }
 

lib/TweetLib.Core/Features/BaseResourceRequestHandler.cs

@@ -34,7 +34,7 @@ namespace TweetLib.Core.Features {
 			if (resourceType is ResourceType.Script or ResourceType.Stylesheet && TweetDeckHashes.Count > 0) {
 				Match match = TweetDeckResourceUrl.Match(url);
 
-				if (match.Success && TweetDeckHashes.TryGetValue($"{match.Groups[1]}.{match.Groups[3]}", out string hash)) {
+				if (match.Success && TweetDeckHashes.TryGetValue($"{match.Groups[1]}.{match.Groups[3]}", out var hash)) {
 					if (match.Groups[2].Value == hash) {
 						App.Logger.Debug("[RequestHandlerBase] Accepting " + url);
 					}

lib/TweetLib.Core/Features/Extensions/ExtensionLoader.cs

@@ -0,0 +1,41 @@
+using System;
+using System.IO;
+using System.Reflection;
+using TweetLib.Api;
+using TweetLib.Core.Systems.Api;
+
+namespace TweetLib.Core.Features.Extensions {
+	public static class ExtensionLoader {
+		public static void LoadAllInFolder(string extensionFolder) {
+			if (!Directory.Exists(extensionFolder)) {
+				return;
+			}
+
+			try {
+				foreach (string file in Directory.EnumerateFiles(extensionFolder, "*.dll", SearchOption.TopDirectoryOnly)) {
+					try {
+						Assembly assembly = Assembly.LoadFile(file);
+						foreach (Type type in assembly.GetTypes()) {
+							if (typeof(TweetDuckExtension).IsAssignableFrom(type) && Activator.CreateInstance(type) is TweetDuckExtension extension) {
+								EnableExtension(extension);
+							}
+						}
+					} catch (Exception e) {
+						App.ErrorHandler.HandleException("Extension Error", "Could not load extension: " + Path.GetFileNameWithoutExtension(file), true, e);
+					}
+				}
+			} catch (DirectoryNotFoundException) {
+				// ignore
+			} catch (Exception e) {
+				App.ErrorHandler.HandleException("Extension Error", "Could not load extensions.", true, e);
+			}
+		}
+
+		private static void EnableExtension(TweetDuckExtension extension) {
+			ApiImplementation apiImplementation = App.Api;
+			apiImplementation.CurrentExtension = extension;
+			extension.Enable(apiImplementation);
+			apiImplementation.CurrentExtension = null;
+		}
+	}
+}

lib/TweetLib.Core/Features/FileDownloadManager.cs

@@ -84,7 +84,7 @@ namespace TweetLib.Core.Features {
 			var settings = new SaveFileDialogSettings {
 				DialogTitle = oneImage ? "Save Image" : "Save Images",
 				OverwritePrompt = oneImage,
-				FileName = qualityIndex == -1 ? filename : $"{author} {Path.ChangeExtension(filename, null)} {firstImageLink.Substring(qualityIndex + 1)}".Trim() + ext,
+				FileName = qualityIndex == -1 ? filename : $"{author} {Path.ChangeExtension(filename, null)} {firstImageLink[(qualityIndex + 1)..]}".Trim() + ext,
 				Filters = new [] { new FileDialogFilter(oneImage ? "Image" : "Images", string.IsNullOrEmpty(ext) ? Array.Empty<string>() : new [] { ext }) }
 			};
 

lib/TweetLib.Core/Features/Notifications/NotificationBrowser.Tweet.cs

@@ -56,7 +56,9 @@ namespace TweetLib.Core.Features.Notifications {
 					menu.AddSeparator();
 
 					if (context.Notification is {} notification) {
-						AddCopyAction(menu, "Copy tweet address", notification.TweetUrl);
+						if (!string.IsNullOrEmpty(notification.TweetUrl)) {
+							AddCopyAction(menu, "Copy tweet address", notification.TweetUrl);
+						}
 
 						if (!string.IsNullOrEmpty(notification.QuoteUrl)) {
 							AddCopyAction(menu, "Copy quoted tweet address", notification.QuoteUrl!);
@@ -72,7 +74,7 @@ namespace TweetLib.Core.Features.Notifications {
 				this.browserComponent.PageLoadEnd -= BrowserComponentOnPageLoadEnd;
 			}
 
-			private void BrowserComponentOnPageLoadEnd(object sender, PageLoadEventArgs e) {
+			private void BrowserComponentOnPageLoadEnd(object? sender, PageLoadEventArgs e) {
 				string url = e.Url;
 
 				if (TwitterUrls.IsTweetDeck(url) && url != BlankURL) {

lib/TweetLib.Core/Features/Plugins/Plugin.cs

@@ -93,7 +93,7 @@ namespace TweetLib.Core.Features.Plugins {
 			return Identifier.GetHashCode();
 		}
 
-		public override bool Equals(object obj) {
+		public override bool Equals(object? obj) {
 			return obj is Plugin plugin && plugin.Identifier.Equals(Identifier);
 		}
 

lib/TweetLib.Core/Features/Plugins/PluginBridge.cs

@@ -48,17 +48,17 @@ namespace TweetLib.Core.Features.Plugins {
 		}
 
 		internal Plugin? GetPluginFromToken(int token) {
-			return tokens.TryGetValue(token, out Plugin plugin) ? plugin : null;
+			return tokens.TryGetValue(token, out var plugin) ? plugin : null;
 		}
 
 		// Event handlers
 
-		private void manager_Reloaded(object sender, PluginErrorEventArgs e) {
+		private void manager_Reloaded(object? sender, PluginErrorEventArgs e) {
 			tokens.Clear();
 			fileCache.Clear();
 		}
 
-		private void Config_PluginChangedState(object sender, PluginChangedStateEventArgs e) {
+		private void Config_PluginChangedState(object? sender, PluginChangedStateEventArgs e) {
 			if (!e.IsEnabled) {
 				int token = GetTokenFromPlugin(e.Plugin);
 
@@ -88,7 +88,7 @@ namespace TweetLib.Core.Features.Plugins {
 		private string ReadFileUnsafe(int token, PluginFolder folder, string path, bool readCached) {
 			string fullPath = GetFullPathOrThrow(token, folder, path);
 
-			if (readCached && fileCache.TryGetValue(token, folder, path, out string cachedContents)) {
+			if (readCached && fileCache.TryGetValue(token, folder, path, out var cachedContents)) {
 				return cachedContents;
 			}
 
@@ -161,7 +161,7 @@ namespace TweetLib.Core.Features.Plugins {
 				cache.Clear();
 			}
 
-			public bool TryGetValue(int token, PluginFolder folder, string path, out string contents) {
+			public bool TryGetValue(int token, PluginFolder folder, string path, [MaybeNullWhen(false)] out string contents) {
 				return cache.TryGetValue(token, Key(folder, path), out contents);
 			}
 

lib/TweetLib.Core/Features/Plugins/PluginLoader.cs

@@ -41,7 +41,7 @@ namespace TweetLib.Core.Features.Plugins {
 		private static Plugin FromFolder(string name, string pathRoot, string pathData, PluginGroup group) {
 			Plugin.Builder builder = new Plugin.Builder(group, name, pathRoot, pathData);
 
-			foreach (var environment in Directory.EnumerateFiles(pathRoot, "*.js", SearchOption.TopDirectoryOnly).Select(Path.GetFileName).Select(EnvironmentFromFileName)) {
+			foreach (var environment in Directory.EnumerateFiles(pathRoot, "*.js", SearchOption.TopDirectoryOnly).Select(Path.GetFileName).Select(EnvironmentFromFileName!)) {
 				builder.AddEnvironment(environment);
 			}
 
@@ -55,7 +55,7 @@ namespace TweetLib.Core.Features.Plugins {
 			string currentContents = string.Empty;
 
 			foreach (string line in File.ReadAllLines(metaFile, Encoding.UTF8).Concat(EndTag).Select(static line => line.TrimEnd()).Where(static line => line.Length > 0)) {
-				if (line[0] == '[' && line[line.Length - 1] == ']') {
+				if (line[0] == '[' && line[^1] == ']') {
 					if (currentTag != null) {
 						SetProperty(builder, currentTag, currentContents);
 					}
@@ -106,7 +106,7 @@ namespace TweetLib.Core.Features.Plugins {
 					builder.ConfigDefault = value;
 					break;
 				case "REQUIRES":
-					builder.RequiredVersion = Version.TryParse(value, out Version version) ? version : throw new FormatException($"Invalid required minimum version: {value}");
+					builder.RequiredVersion = Version.TryParse(value, out var version) ? version : throw new FormatException($"Invalid required minimum version: {value}");
 					break;
 				default:
 					throw new FormatException($"Invalid metadata tag: {tag}");

lib/TweetLib.Core/Features/Plugins/PluginManager.cs

@@ -102,7 +102,7 @@ namespace TweetLib.Core.Features.Plugins {
 			Executed?.Invoke(this, new PluginErrorEventArgs(errors));
 		}
 
-		private void Config_PluginChangedState(object sender, PluginChangedStateEventArgs e) {
+		private void Config_PluginChangedState(object? sender, PluginChangedStateEventArgs e) {
 			browserExecutor?.RunFunction("TDPF_setPluginState", e.Plugin, e.IsEnabled);
 		}
 

lib/TweetLib.Core/Features/TweetDeck/TweetDeckBrowser.cs

@@ -71,12 +71,12 @@ namespace TweetLib.Core.Features.TweetDeck {
 			App.UserConfiguration.SoundNotificationChanged -= UserConfiguration_SoundNotificationChanged;
 		}
 
-		private void browserComponent_BrowserLoaded(object sender, BrowserLoadedEventArgs e) {
+		private void browserComponent_BrowserLoaded(object? sender, BrowserLoadedEventArgs e) {
 			e.AddDictionaryWords("tweetdeck", "TweetDeck", "tweetduck", "TweetDuck", "TD");
 			isBrowserReady = true;
 		}
 
-		private void browserComponent_PageLoadStart(object sender, PageLoadEventArgs e) {
+		private void browserComponent_PageLoadStart(object? sender, PageLoadEventArgs e) {
 			string url = e.Url;
 
 			if (TwitterUrls.IsTweetDeck(url) || (TwitterUrls.IsTwitter(url) && !TwitterUrls.IsTwitterLogin2Factor(url))) {
@@ -84,7 +84,7 @@ namespace TweetLib.Core.Features.TweetDeck {
 			}
 		}
 
-		private void browserComponent_PageLoadEnd(object sender, PageLoadEventArgs e) {
+		private void browserComponent_PageLoadEnd(object? sender, PageLoadEventArgs e) {
 			string url = e.Url;
 
 			if (TwitterUrls.IsTweetDeck(url)) {
@@ -105,7 +105,7 @@ namespace TweetLib.Core.Features.TweetDeck {
 			browserComponent.RunBootstrap("update");
 		}
 
-		private void pluginManager_Reloaded(object sender, PluginErrorEventArgs e) {
+		private void pluginManager_Reloaded(object? sender, PluginErrorEventArgs e) {
 			if (e.HasErrors) {
 				App.MessageDialogs.Error("Error Loading Plugins", "The following plugins will not be available until the issues are resolved:\n\n" + string.Join("\n\n", e.Errors));
 			}
@@ -115,14 +115,14 @@ namespace TweetLib.Core.Features.TweetDeck {
 			}
 		}
 
-		private void pluginManager_Executed(object sender, PluginErrorEventArgs e) {
+		private void pluginManager_Executed(object? sender, PluginErrorEventArgs e) {
 			if (e.HasErrors) {
 				App.MessageDialogs.Error("Error Executing Plugins", "Failed to execute the following plugins:\n\n" + string.Join("\n\n", e.Errors));
 			}
 		}
 
-		private void updateChecker_CheckFinished(object sender, UpdateCheckEventArgs e) {
+		private void updateChecker_CheckFinished(object? sender, UpdateCheckEventArgs e) {
-			var updateChecker = (UpdateChecker) sender;
+			var updateChecker = (UpdateChecker) sender!;
 
 			e.Result.Handle(update => {
 				string tag = update.VersionTag;
@@ -144,7 +144,7 @@ namespace TweetLib.Core.Features.TweetDeck {
 			ignoreUpdateCheckError = true;
 		}
 
-		private void UserConfiguration_GeneralEventHandler(object sender, EventArgs e) {
+		private void UserConfiguration_GeneralEventHandler(object? sender, EventArgs e) {
 			UpdatePropertyObject();
 		}
 
@@ -236,6 +236,11 @@ namespace TweetLib.Core.Features.TweetDeck {
 			private const string UrlVersionCheck = "/web/dist/version.json";
 
 			public override RequestHandleResult? Handle(string url, ResourceType resourceType) {
+				var result = base.Handle(url, resourceType);
+				if (result != null) {
+					return result;
+				}
+				
 				switch (resourceType) {
 					case ResourceType.MainFrame when url.EndsWithOrdinal("://twitter.com/"):
 						return new RequestHandleResult.Redirect(TwitterUrls.TweetDeck); // redirect plain twitter.com requests, fixes bugs with login 2FA
@@ -256,7 +261,7 @@ namespace TweetLib.Core.Features.TweetDeck {
 						return new RequestHandleResult.Redirect(url.Replace("include_entities=1", "include_entities=1&include_ext_has_nft_avatar=1"));
 
 					default:
-						return base.Handle(url, resourceType);
+						return null;
 				}
 			}
 		}

lib/TweetLib.Core/Features/TweetDeck/TweetDeckExtraContext.cs

@@ -24,15 +24,15 @@ namespace TweetLib.Core.Features.TweetDeck {
 
 			switch (type) {
 				case "link":
-					Link = new Link(url!, url!);
+					Link = new Link(url, url);
 					break;
 
 				case "image":
-					Media = new Media(Type.Image, TwitterUrls.GetMediaLink(url!, App.UserConfiguration.TwitterImageQuality));
+					Media = new Media(Type.Image, TwitterUrls.GetMediaLink(url, App.UserConfiguration.TwitterImageQuality));
 					break;
 
 				case "video":
-					Media = new Media(Type.Video, url!);
+					Media = new Media(Type.Video, url);
 					break;
 			}
 		}

lib/TweetLib.Core/Features/Twitter/ImageUrl.cs

@@ -57,7 +57,7 @@ namespace TweetLib.Core.Features.Twitter {
 				return false;
 			}
 
-			string originalUrl = url.Substring(0, question);
+			string originalUrl = url[..question];
 
 			obj = new ImageUrl(Path.HasExtension(originalUrl) ? originalUrl : originalUrl + imageExtension, imageQuality);
 			return true;

lib/TweetLib.Core/Features/Twitter/TwitterUrls.cs

@@ -49,11 +49,11 @@ namespace TweetLib.Core.Features.Twitter {
 		}
 
 		public static UrlType Check(string url) {
-			if (url.Contains("\"")) {
+			if (url.Contains('"')) {
 				return UrlType.Invalid;
 			}
 
-			if (Uri.TryCreate(url, UriKind.Absolute, out Uri uri)) {
+			if (Uri.TryCreate(url, UriKind.Absolute, out var uri)) {
 				string scheme = uri.Scheme;
 
 				if (scheme == Uri.UriSchemeHttps || scheme == Uri.UriSchemeHttp || scheme == Uri.UriSchemeFtp || scheme == Uri.UriSchemeMailto) {

lib/TweetLib.Core/Systems/Api/ApiImplementation.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using TweetLib.Api;
+
+namespace TweetLib.Core.Systems.Api {
+	public class ApiImplementation : ITweetDuckApi {
+		public TweetDuckExtension? CurrentExtension { get; internal set; }
+
+		private readonly Dictionary<Type, ITweetDuckService> services = new Dictionary<Type, ITweetDuckService>();
+
+		internal ApiImplementation() {}
+
+		public void RegisterService<T>(T service) where T : class, ITweetDuckService {
+			if (!typeof(T).IsInterface) {
+				throw new ArgumentException("Api service implementation must be registered with its interface type.");
+			}
+
+			services.Add(typeof(T), service);
+		}
+
+		public T? FindService<T>() where T : class, ITweetDuckService {
+			return services.TryGetValue(typeof(T), out ITweetDuckService? service) ? service as T : null;
+		}
+	}
+}

lib/TweetLib.Core/Systems/Configuration/ConfigManager.cs

@@ -10,13 +10,13 @@ using TweetLib.Utils.Static;
 
 namespace TweetLib.Core.Systems.Configuration {
 	public abstract class ConfigManager {
-		protected static TypeConverterRegistry ConverterRegistry { get; } = new ();
+		public static TypeConverterRegistry ConverterRegistry { get; } = new ();
 
 		static ConfigManager() {
 			ConverterRegistry.Register(typeof(WindowState), new BasicTypeConverter<WindowState> {
 				ConvertToString = static value => $"{(value.IsMaximized ? 'M' : '_')}{value.Bounds.X} {value.Bounds.Y} {value.Bounds.Width} {value.Bounds.Height}",
 				ConvertToObject = static value => {
-					int[] elements = StringUtils.ParseInts(value.Substring(1), ' ');
+					int[] elements = StringUtils.ParseInts(value[1..], ' ');
 
 					return new WindowState {
 						Bounds = new Rectangle(elements[0], elements[1], elements[2], elements[3]),

lib/TweetLib.Core/Systems/Logging/Logger.cs

@@ -43,7 +43,7 @@ namespace TweetLib.Core.Systems.Logging {
 				build.Append("Please, report all issues to: ").Append(Lib.IssueTrackerUrl).Append("\r\n\r\n");
 			}
 
-			build.Append("[").Append(DateTime.Now.ToString("G", Lib.Culture)).Append("] ").Append(level).Append("\r\n");
+			build.Append('[').Append(DateTime.Now.ToString("G", Lib.Culture)).Append("] ").Append(level).Append("\r\n");
 			build.Append(message).Append("\r\n\r\n");
 
 			try {

lib/TweetLib.Core/Systems/Updates/UpdateChecker.cs

@@ -37,7 +37,7 @@ namespace TweetLib.Core.Systems.Updates {
 			InteractionManager.Dispose();
 		}
 
-		private void timer_Elapsed(object sender, ElapsedEventArgs e) {
+		private void timer_Elapsed(object? sender, ElapsedEventArgs e) {
 			Check(false);
 		}
 

lib/TweetLib.Core/Systems/Updates/UpdateInteractionManager.cs

@@ -26,7 +26,7 @@ namespace TweetLib.Core.Systems.Updates {
 			nextUpdate = null;
 		}
 
-		private void updates_CheckFinished(object sender, UpdateCheckEventArgs e) {
+		private void updates_CheckFinished(object? sender, UpdateCheckEventArgs e) {
 			UpdateInfo? foundUpdate = e.Result.HasValue ? e.Result.Value : null;
 
 			if (nextUpdate != null && !nextUpdate.Equals(foundUpdate)) {