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qt: CWE-367: fix TOCTOU race condition in CompositorDirectComposition

Fatih Uzunoğlu requested to merge fuzun/vlc:qt/dcomptoctou into master

This is a potential (but unlikely, since scene graph initialization is expensive and unlikely to be completed that fast) case when threaded scene graph is in use, which is the default.

QQuickView::isSceneGraphInitialized() is also not reported to be thread safe, I'm not sure if we can use it in this manner.

Edited by Fatih Uzunoğlu

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