Prevent "flashing" of characters

[oakmac]

It would be nice to prevent the "character flashing" when Parinfer applies.

TODO: make a gif of this happening for reference

[oakmac]

Reference links:

• Vim mode has a way of handling key events: https://github.com/VSCodeVim/Vim/blob/master/extension.ts#L145-L156

From microsoft/vscode#5280 (comment)

type, compositionstart and compositionend - I have added these to our API for VIM emulation. They were not part of the API, but they are the only means to get visible input. If you are using these for something else than VIM, please don't.