Crash in QWindow::event if "delete this" called in QDialog::closeEvent

Calling delete this in QDialog::closeEvent causes a crash starting from Qt 5.11 due to https://codereview.qt-project.org/c/qt/qtbase/+/227398.

qt\qtbase\src\gui\kernel\qwindow.cpp:625: error: Debugger encountered an exception: Exception at 0x7ffe90fca11d, code: 0xc0000005: read access violation at: 0xffffffffffffffff, flags=0x0 (first chance)

Call stack:

1 QWindow::isVisible qwindow.cpp 625 0x7ffe90fca11d
2 QWindow::event qwindow.cpp 2325 0x7ffe90fce3e5
3 QWidgetWindow::event qwidgetwindow.cpp 255 0x7ffe93525d02
4 QApplicationPrivate::notify_helper qapplication.cpp 3685 0x7ffe93472c4f
5 QApplication::notify qapplication.cpp 3025 0x7ffe9346ce07
6 QCoreApplication::notifyInternal2 qcoreapplication.cpp 1075 0x7ffe92c12aa0
7 QCoreApplication::sendSpontaneousEvent qcoreapplication.cpp 1483 0x7ffe92c1293b
8 QGuiApplicationPrivate::processCloseEvent qguiapplication.cpp 2562 0x7ffe90fa9332
9 QGuiApplicationPrivate::processWindowSystemEvent qguiapplication.cpp 1981 0x7ffe90faa235
10 QWindowSystemInterface::sendWindowSystemEvents qwindowsysteminterface.cpp 1176 0x7ffe90f74602
11 QWindowsGuiEventDispatcher::sendPostedEvents qwindowsguieventdispatcher.cpp 83 0x7ffeae0567d2
12 QEventDispatcherWin32::processEvents qeventdispatcher_win.cpp 525 0x7ffe92ce4b6e
13 QWindowsGuiEventDispatcher::processEvents qwindowsguieventdispatcher.cpp 74 0x7ffeae056784
14 QEventLoop::processEvents qeventloop.cpp 139 0x7ffe92c0d1cd
15 QEventLoop::exec qeventloop.cpp 225 0x7ffe92c0d41f
16 QCoreApplication::exec qcoreapplication.cpp 1383 0x7ffe92c1076a
17 QGuiApplication::exec qguiapplication.cpp 1861 0x7ffe90fa2aa8
18 QApplication::exec qapplication.cpp 2826 0x7ffe9346c71a
19 main main.cpp 35 0x7ff71cf4159f
20 invoke_main exe_common.inl 79 0x7ff71cf41e44
... <More>

Steps to reproduce the crash:

1. Run the attached example
2. Close the dialog window