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RowCount should decrement by the number of rows removed from the NSOutLineView using RemoveRows, however this behavior does not occur, and RowCount maintains the value it had prior to row removal.
I have tried this issue but I am unable to reproduce this issue.
Could you please provide test sample or test steps ? So that we can reproduce this issue at our end.
According to Apple's documentation (in the NSOutlineView header), you aren't supposed to use RemoveRows with NSOutlineView, you should use RemoveItems instead. I replied to the desk case to let him know and he said RemoveItems worked correctly for him.
Added the unavailable attribute to RemoveRows (and InsertRows) in a0f9e50d931a80b630078a9916dcc959fc1a25b7