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Specifies the maximum number of undo items an UndoStack can contain. The default value is -1, which means no limit exists to the number of undo items an UndoStack can contain.
Setting this property does not remove undo items from UndoStacks. When you push an undo item onto an UndoStack, the UndoStack removes the oldest undo items from the UndoStack so that the number of items on the UndoStack does not exceed the UndoLimit.
The Engine initializes this property to -1. The Engine does not persist the value of this property.