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Undo and redo part 2

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Got a simple application with undo/redo up and running today. Basically each of the buttons registers a ButtonPressAction every time they are pressed, and if you do a undo you register a ButtonPressRemoveAction. And the code to actuallt undo/redo is index based, it manipulates the listbox.items at the current index.
The CircularStack class is made in a couple of seconds so I won't take any responsibility on that it is perfect :)

Try it if you want. Clicky
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