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Safeguard QQuickWindow::hide() against other GL contexts.
Gunnar Sletta authored
If another GL context is bound to another surface on the GUI
thread, we can run into issues while cleaning up the SG nodes.

Task-number: QTBUG-34898
Change-Id: Ifa02b7cdbc7ab38b3a149a21452cc5071498a7d1
Reviewed-by: default avatarLaszlo Agocs <laszlo.agocs@digia.com>
91e2c5d7