Undo/Redo Bugs

[matteobart]

Undo/Redo don't seem to be working properly.
Redo doesn't seem to do anything. (Never appears to be available) May need to be adjusted after undo is caused.
Undo doesn't appear as often as it should.

[matteobart]

In latest commit (num 85: commit 24c79), this has been greatly improved.

There is still a bug where you repeatedly undo and redo, where nothing appears to be happening. After enough undos (or redos), it works. Although for most cases everything should work fine.