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Bug
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    Resolution: Done
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P2: Important
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    5.8.0, 5.15.2
 
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        3d71c4b740d23d5c3f380f495990f35ea17dc2a0 (qt/qtbase/dev)
 
Context menu events are not generated for mouse presses for any other type of window except widget windows. For example, when embedding QOpenGLWindow or QQuickView through QWidget::createWindowContainer, the event is never generated for those windows. Looks like that is because they are generated from mouse press events only in QWidgetWindow::handleMouseEvent() at src/widgets/kernel/qwidgetwindow.cpp:563 .
Context menu events from keyboard do work.