Follow-up Comment #8, bug #25607 (project gnustep):
I looked at -groupingLevel while investigating this and I recall that ...
before calling -beginUndoGrouping it reports zero
after calling -beginUndoGrouping it reports two
after calling -endUndoGrouping it reports one
after an extra call to -endUndoGrouping it reports zero
To be absolutely sure, I just added a few testcases to
NSUndoManager/NSUndoManager_notifications.m and can confirm that all the tests
in this file pass on may MacOS-X 10.5 system using the Apple Foundation.
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