Comment 12 for bug 1436405

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Nick Dedekind (nick-dedekind) wrote :

I believe the issue may lie with Qt. QMenuBar only supports "native" menu bars in OSX & windows CE as stated in http://doc.qt.io/qt-5/qmenubar.html#nativeMenuBar-prop

This causes calls to QMenuBar::setVisible to fall through to QWidget::setVisible which then sets the menu bar visual component of the app window to visible.