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xcb: fix thread synchronization in QXcbEventQueue::waitForNewEvents() again

(cherry picked from commit b427721f) (from Qt 5.12)

According to, a version of this commit is included in branches 6.1, 6.2, dev. As far as I can tell, it has been cherry-picked to Qt 5.15, not only to Qt 5.12.

I don't know if this bug affects a KDE product. only requires "referencing a relevant defect report in an open source product". Here is a reference to a GoldenDict issue fixed by this commit:

See also the commit message.

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