Bug#421854: xcb lock assertion with opera

[Eirik Byrkjeflot Anonsen <eirik@opera.com>]

I was sure I'd read somewhere on the xorg list that the xcb lock
assertions were invariably triggered by bugs in xlib.  I guess I
should know better than to trust my memory for such things :)

While opera does access xlib directly (I believe through plain xlib,
xft and xrender), I'd be very surprised if we do any explicit locking.
And indeed "grep -r '[Ll]ockDisplay'" turns up no relevant matches in
the opera source tree.  So I'd think the most likely culprit would be
qt.

eirik