Peter Hutterer 87564543d9 Only decrement buttonsDown when the button count is greater than 0. ...

Device drivers flush their buttons on device init and cause a button down
event to be generated. If we unconditionally decrease the buttons, we won't be
able to ever get a passive device grab.

Format documentation for CheckDeviceGrabs to make it readable.
(cherry picked from commit 3e894974cd)

Conflicts:

	Xi/exevents.c

2007-06-25 09:35:30 +09:30

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