Member variable DataRef():undo Foundation
A code block executed by the method :undo().
The instance variable :undo contains an optional code block which is executed by the method :undo(). self is passed to the code block and it must return the value which is to replace the current value in the edit buffer of the Xbase Part. If no code block is specified, the method :undo() assigns the instance variable :undoBuffer to the edit buffer.
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