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Undo/Redo Support

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It would be useful to undo and redo your actions. We need to think of a system to implement this. This system will probably be an Action based design. An action based design means that all options that the View control is able to do; are implemented as actions. There will be classes like CutSelectionAction, PasteSelectionAction.
 
Doing things like this seems the most appropriate way.

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