Hello! Here is a patch for NSUndoManager. The patch prevents NSUndoManager from (incorrectly!) posting NSUndoManagerDidOpenUndoGroupNotification andNSUndoManagerWillCloseUndoGroupNotification notifications when performing
an undo or redo. Furthermore, with this patch the private -_loop: method no longer opens a new undo group automatically. This is a) unnecessary because the methods -forwardInvocation: and-registerUndoWithTarget:selector:object: already take care of this, and
b) can needlessly create empty undo groups on the undo stack. Creating such empty groups will confuse the change count management in NSDocument. For the same reason, the patch changes the code in -setRunLoopModes: such that it will not schedule a call to -_loop: unconditionally.
As a consequence of these changes, the change count of an NSDocument now becomes zero again after undoing all changes in the document. Wolfgang
NSUndoManager.patch
Description: Binary data
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