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Created attachment 1003 [details]
This is a possible test for the desired functionality.
The System.Windows.Forms.Form.OnFormClosing implementation should allow a later registered handler to override an earlier handler's cancel request. This behaviour is observed in Windows, and, from what I can tell of the code, should be observed in Mono. I submit this test not because Mono is behaving incorrectly, but because this behaviour should be made explicit (it's not in the MSDN docs).