If you drag-and-drop a OpenGLWidget in Designer, the main window gets re-created when the OpenGLWidget is instantiated. So in general (in rare cases), at the end of QWidgetWindow::handleMouseEvent() we might have a different window, and therefore can't reliably call QWindowPrivate::maybeSynthesizeContextMenuEvent() without checking for a valid pointer. Amends 84a5f50c7766c99f62b22bb4388137e0aa8dd13d Fixes: QTBUG-132912 Change-Id: I7b220b4daceab988aadabf9427ef6b2d5624e00d Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io> (cherry picked from commit 1accd2421686b387daa115b3a46974fce0fdb118) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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