The window splitting was refactored to initialize the editor async. So, we have to wait till the editor will become available.
This can't be done while holding the EDT, so we start this bunch of tests from the non-EDT thread.
The problem happens in tests: after the refactorings in 242, the `EditorListenerTracker` may be called before the initialization of the IdeaVim. In this case, it'll report the VimDocumentListener as a leaked listener, however, it's incorrect.
Generally, I think that this situation with the listener tracker is a bug.
There should be no changes in IdeaVim behaviour as the multicaster does the same thing: subscribes every editor on this listener. However, the multicaster does this in the "registerEditor" stage. However, I don't think this is a problem.
The problem happens in tests: after the refactorings in 242, the `EditorListenerTracker` may be called before the initialization of the IdeaVim. In this case, it'll report the FocusChangeListener as a leaked listener, however, it's incorrect.
Generally, I think that this situation with the listener tracker is a bug.
There should be no changes in IdeaVim behaviour as the multicaster does the same thing: subscribes every editor on this listener. However, the multicaster does this in the "registerEditor" stage. However, I don't think this is a problem.
With the AI functionality, the shortcut ctrl-right got more important. However, previously it was defined as VIM_ONLY shortcut. However, taking the fact that IJ defines several actions for such shortcuts, it's not clear why we prohibit the users from using these shortcuts with the IDE actions.
Taking the fact, that we default shortcuts to VIM, I expect no changes in the behaviour.
However, just arrows are still hidden from setting the IDE handler. I think, it reduces the cognitive load for the user, especially taking the fact that arrows work almost equally in vim and IJ.
List is based on Vim's documentation, although not all digraphs are documented. Additional digraphs are added based on the output of `:digraphs`. These additional digraphs include some digraphs that produce the same character, so the code is updated to handle duplicates, with the same ordering/priority as Vim.
Extra digraphs include the Euro symbol (`=e` and `Eu`), quadruple prime (`4'`) and bullet (`oo`), amongst others.
Also removes a number of non-standard digraphs. The symbols generated don't match the descriptions. The code appears to be private use, so are not reliable. Once custom digraphs are implemented, they can be easily added back in `~/.ideavimrc`
Vim only use the `~` prefix if the encoding is "latin1". We can just treat it as though the encoding is Unicode, and match the other places we format printable characters. Note that for Vim, if `'display'` contains "uhex", then all unprintable characters are shown in hex, including control characters (`^C`, etc.). IdeaVim does not support the `'display'` option.
