Adds extra tests to confirm that deleting previous word in Insert mode was already working as expected (relates to VIM-1650)
Also fixes an edge case for a test that was marked as behaving differently to Vim, but was actually showing buggy behaviour due to its unorthodox caret placement. It looked like the caret was placed at the end of the line, but it was actually placed _passed_ the last character in the file. Adding extra text below the caret placement would cause the action to behave as expected, and the test would then match Vim behaviour. However, it is possible to get this caret position in the editor and in Vim, with `virtualedit=onemore`, and the IdeaVim implementation was wrong. The test has been updated to provide the correct scenario, and the implementation has been fixed.
This is needed for the new terminal. Before this change, it was impossible to put the caret at the line end, even taking the fact the IdeaVim is disabled in the new terminal.
Simplify and reorganize logic in isEnabled() for improved readability and maintainability. Adjust logging messages for consistency and replace unused exception variable with underscore.
As the GitHub Copilot is placed right in the editor component, the IdeaVim's actions are also collected. Action promoter promotes the IdeaVim's action and, since the data context has the editor, executes a Vim's actions like backspace.
Now we make sure that IdeaVim works only in the actual editor.
Since this change may affect some places where the IdeaVim used to work, but won't work now (this will be a surprise), a registry key is introduced to help the users that face this problem.
Matt Ellis