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VLC 4: Crash during reattaching (docking) the playqueue

Initial testing shows that it's a Qt bug. Qt version 5.11.3 is affected, 5.15.2 is not tested yet.

1   QMetaObject::cast(QObject const *) const                                                          0x7fffddf42a27 
2   QQuickOverlay::overlay(QQuickWindow *)                                                            0x7fffc3d6b22a 
3   QQuickPopupPrivate::setWindow(QQuickWindow *)                                                     0x7fffc3d70d30 
4   QMetaObject::activate(QObject *, int, int, void * *)                                              0x7fffddf64136 
5   QQuickItem::windowChanged(QQuickWindow *)                                                         0x7ffff44fe112 
6   QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
7   QQuickItemPrivate::derefWindow()                                                                  0x7ffff4510641 
8   QQuickItemPrivate::derefWindow()                                                                  0x7ffff4510641 
9   QQuickShaderEffectSource::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&)   0x7ffff4618d0d 
10  QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
11  QQuickOpenGLShaderEffectCommon::updateWindow(QQuickWindow *)                                      0x7ffff462141f 
12  QQuickShaderEffect::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&)         0x7ffff461af2a 
13  QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
14  QQuickShaderEffectSource::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&)   0x7ffff4618d0d 
15  QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
16  QQuickOpenGLShaderEffectCommon::updateWindow(QQuickWindow *)                                      0x7ffff462141f 
17  QQuickShaderEffect::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&)         0x7ffff461af2a 
18  QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
19  QQuickShaderEffectSource::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&)   0x7ffff4618d0d 
20  QQuickItemPrivate::derefWindow()                                                                  0x7ffff451069b 
... <More>                                                                                                           

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