Undo / Redo Functionality

Registered by Michael Rooney on 2010-03-25

It would be great to provide undo/redo functionality.

This can probably be implemented in a fairly slick way by instantiating a class which listens to change events and records them. When an undo is triggered, it performs the opposite of the last action, and that action goes in the redo queue, not the undo. Then a redo of course reverses the thing in the redo queue.

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