Method XbpMLE():undo() Foundation
Undo changes in the edit buffer.
:undo() --> lSuccess
This method returns the value .T. (true) if the changes made to the edit buffer could be undone, otherwise .F. (false) is returned.
The method :undo() resets the text in the edit buffer to what it was before editing began. For this method to be successful, the instance variable :undo must contain the value .T. (true) (this is the default setting). Changes can be undone until the method :getData() is executed.
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