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kwinglutils: Assert glFenceSync

Kai Uwe Broulik requested to merge work/kbrouli/fence-sync-assert into master

This really should not fail unless we did something seriously wrong on our end, such as changing GL context during paintScreen.

If we add an invalid GLSync to the queue it can lead to very hard to debug crashes in seemingly unrelated parts of the rendering process, when the queue is drained, potentially seconds after the actual failure that occurred here.

Signed-off-by: Eike Hein eike.hein@mbition.io

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