Undo behavior with {}[]()<> does not act exactly as it should

[xconverge]

@johnfn took a quick stab at this issue in 7ac106d but the behavior does not fully match the way vim works yet.

When writing something where you open and close the brackets then fill in the interior, a new undo point should be created.

ex:
if(true){
}

then filling in

if(true){
int i = 0;
}

an undo point is created in the first step during insert mode, so pressing u once will get back to the first step, and pressing u again will clear it all.

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Technical details:

• VSCode Version: 1.4.0
• VsCodeVim Version: master as of 7ac106d
• OS: OSX

[xconverge]

Also, if I write something like:

0
0

then move the cursor to the first 0, and use ctrl+a to increment it, then move the cursor to the 2nd 0 and use ctrl+a to increment it. Pressing u Undoes both, it should only undo one

There is still something funky about when new undo points are created

[johnfn]

Ah, that's because ctrl-a is treated as a movement, not a command. Easy fix for anyone to pick up. :)