[bug #25607] NSUndoManager sends NSUndoManagerCheckpointNotification when opening a top-level undo group

[David Ayers]

Follow-up Comment #7, bug #25607 (project gnustep):

OK. So now 2 groups are created... that is very unfortunate and unexpected.

We would like to ignore any checkpoint notification during the top level
beginUndoGrouping.  It also seems strange that the implicit grouping will
never be matched with a endUndoGroup.  

Could I ask you validate what -groupingLevel reports during the processing of
check point notification (especially the first two) when the manager groups by
events?


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