Undo, redo, predo, preundo

Undo and redo are nice, but what i'd like to see is: Predo.

Undo provides a way to reverse what you've just done.

Redo is a way to unreverse what you've just undone.

Predo will be a way to do what you've not yet done.

And preundo would be a way to avoid doing what you've not yet done.

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