On Oct 12, 2012, at 3:12 AM, Ken Thomases <[email protected]> wrote:

> 
>> This is a problem for me because I don't receive keyUp
>> or mouseUp events if I start Mission Control with a mouse button or a key
>> held down and my application will behave as if that mouse button or key is
>> held down.
> 
> First, it seems somewhat unusual for Mission Control to be engaged in the 
> middle of a mouse-down/mouse-up or key-down/key-up sequence.

It's actually common. If you use the Magic Trackpad gesture to invoke mission 
control, it's quite easy to accidentally depress the trackpad button while 
performing the gesture. This causes the app's event loop to get wedged, and you 
have to pump it manually with clicks in order to get it unstuck. (I've filed a 
radar.)

--Kyle Sluder
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