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/*!
    \example demos/undo
    \title Undo Framework

    This demo shows Qt's undo framework in action.

    \image undodemo.png

    Qt's undo framework is an implementation of the Command
    pattern, which provides advanced undo/redo functionality. 

    To show the abilities of the framework, we have implemented a
    small diagram application in which the diagram items are geometric
    primitives.  You can edit the diagram in the following ways: add,
    move, change the color of, and delete the items.
*/