Support local undo/redo stacks for collaborators

[Chuxel]

Currently the private preview has a unified undo/redo stack for everyone in the collaboration session. This can cause unexpected behaviors when individuals are not editing the same section of code. This is a significant technical challenge to overcome, but is worth taking on if we get sufficient interest and feedback.

[loganintech]

This should be considered an essential feature, in my opinion.

I had a multi-hour live share session going with a coworker for a mini-sprint and we were constantly undoing each-others code, on accident of course. Undo/Redo features are something we accept as universal and the work for this feature would be worth it.

[kbatman37]

+1 This is particularly confusing and limits the effectiveness of the tool

[MeguminSama]

+1 This is a really well needed feature. Looking forward to it's release ;)

[AlexanderEvans]

I Agree, this is a must have feature. Even worse than not undoing what you wanted, if you forget and don't realize it you can undo your partners code back accident. Often code they just fixed, and don't expect to find an error in. This is very important to implement!

[Chuxel]

This should now be available in v0.3.392/v.0.393. However, for VS you need to be on 15.7. VS 15.6 will still have global undo.