Comment 7 for bug 741869

As mentioned in duplicate bug 806255:
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FYI, the root cause of this bug appears to be because compiz uses XkbStateNotify, which is part of the X Keyboard Extension. Using this extension has the unfortunate side-effect (by design) of ignoring grabs held by other clients and still giving you key events even when you shouldn't be receiving them. This is documented is the spec:

"As with all Xkb events, XkbStateNotify events are reported to all interested clients without regard to the current keyboard input focus or grab state."
[http://www.x.org/releases/X11R7.6/doc/libX11/specs/XKB/xkblib.html]
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The only remaining fix for this bug is to rewrite the modifier handling code in compiz to not use XkbStateNotify at all. Because that is the root cause of this bug. However that's a very large and risky change we can't afford to do for a while. :(
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