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Create empty undo stack.
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Destructor destroys all items on stack.
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Clears the complete undo stack.
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Add an undo item to the stack. If the stack is not at the end, discard remaining items. Takes ownership of item. |
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Perform an undo operation.
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Perform a redo operation.
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Return text for possible undo operation.
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Return text for possible redo operation.
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Is an Undo action available?
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Is a Redo action available?
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