"Undo" and "Redo" action should apply to a whole multicommand instead of each child action in it

[TMPxyz]

If we execute a multicmd consisting of five "cursorDown" sub-actions, then press "ctrl-z" should undo the whole multicmd instead of a single "cursorDown".

[Bobronium]

I'm new to VSCode, but looking at what extension does, It'll probably require some trickery like remembering the number of executed actions, monitoring current state in history, hijacking Undo shortcut and upon its activation execute some logic depending on current context.

Sounds like a hassle, but I really hope I'm just missing something. @ryuta46, do you have any better insights or hints on this?