XCB: WA_DeleteOnClose and closing a window while the application is busy can lead to a crash

1  ??                                                                               0x663740       
2  QGuiApplicationPrivate::processActivatedEvent    qguiapplication.cpp        2291 0x7ffff62bf7b8 
3  QGuiApplicationPrivate::processWindowSystemEvent qguiapplication.cpp        1858 0x7ffff62c438a 
4  QWindowSystemInterface::sendWindowSystemEvents   qwindowsysteminterface.cpp 1071 0x7ffff629b7c0 
5  xcbSourceDispatch                                qxcbeventdispatcher.cpp    105  0x7ffff7ea633e 
6  g_main_context_dispatch                                                          0x7ffff4d91197 
7  ??                                                                               0x7ffff4d913f0 
8  g_main_context_iteration                                                         0x7ffff4d9149c 
9  QEventDispatcherGlib::processEvents              qeventdispatcher_glib.cpp  422  0x7ffff73d4291 
10 QXcbGlibEventDispatcher::processEvents           qxcbeventdispatcher.cpp    143  0x7ffff7ea66be 
11 QEventLoop::processEvents                        qeventloop.cpp             138  0x7ffff73723cb 
12 QEventLoop::exec                                 qeventloop.cpp             225  0x7ffff7372844 
13 QCoreApplication::exec                           qcoreapplication.cpp       1363 0x7ffff737c46a 
14 QGuiApplication::exec                            qguiapplication.cpp        1779 0x7ffff62b93ea 
15 QApplication::exec                               qapplication.cpp           2908 0x7ffff7835713 
16 main                                             main.cpp                   19   0x400e32