I was wondering for a long time if there’s a way to keep the undo stack in case of

closed tabs or window. The thing is that my workflow sometimes includes a lot of 

experimenting with code and then doing a lot of undos to go back to a state without

those experiments. But if TextMate for example crashes I lose this ability.

Usually I can use git diff in this case, but still it would be nice to have ⌘Z working

after crashes at least.