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performKeyEquivalent called twice for some key strokes

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performKeyEquivalent called twice for some key strokes

Subject: performKeyEquivalent called twice for some key strokes
From: Leonid Romanov <email@hidden>
Date: Fri, 23 Aug 2013 17:17:01 +0400

Hello,
Pressing "Command +" results in two -performKeyEquivalent calls. Here is a stack trace snippet for the first call:

	1   AppKit                              0x00007fff903da2f9 -[NSView _performKeyEquivalent:conditionally:] + 41
	2   AppKit                              0x00007fff903da442 -[NSView performKeyEquivalent:] + 166
	3   AppKit                              0x00007fff903da2f9 -[NSView _performKeyEquivalent:conditionally:] + 41
	4   AppKit                              0x00007fff903da259 -[NSWindow performKeyEquivalent:] + 64
	5   AppKit                              0x00007fff903da044 -[NSApplication _handleKeyEquivalent:] + 462
	6   AppKit                              0x00007fff90297173 -[NSApplication sendEvent:] + 4480


And for the second call:

	1   AppKit                              0x00007fff903da2f9 -[NSView _performKeyEquivalent:conditionally:] + 41
	2   AppKit                              0x00007fff903da442 -[NSView performKeyEquivalent:] + 166
	3   AppKit                              0x00007fff903da2f9 -[NSView _performKeyEquivalent:conditionally:] + 41
	4   AppKit                              0x00007fff903da259 -[NSWindow performKeyEquivalent:] + 64
	5   AppKit                              0x00007fff903da044 -[NSApplication _handleKeyEquivalent:] + 462
	6   AppKit                              0x00007fff900e3927 -[NSApplication _handleSpecialAlternateKeyEquivalent:] + 656
	7   AppKit                              0x00007fff9029718e -[NSApplication sendEvent:] + 4507

As you can see, the second -performKeyEquivalent call is initiated by -[NSApplication _handleSpecialAlternateKeyEquivalent:]. So, could anyone tell me what is so special about "Command +" key stroke that it warrants not one, but two -performKeyEquivalent calls, and how do I filter out the second call?

Thanks,
Leonid.
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