tst_QGraphicsProxyWidget::bypassGraphicsProxyWidget crashes on Mac (and Windows)

(gdb) bt
#0 0x00000001002bf5fc in QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::data (this=0x47) at qscopedpointer.h:156
#1 0x00000001000dabcc in qGetPtrHelper<QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> > > (p=@0x47) at qglobal.h:889
#2 0x00000001000e76a1 in QWidget::d_func (this=0x3f) at qwidget.h:129
#3 0x0000000100141250 in QGestureManager::filterEvent (this=0x102466a40, receiver=0x11774c640, event=0x7fff5fbfcea0) at kernel/qgesturemanager.cpp:483
#4 0x00000001000dc519 in QApplication::notify (this=0x7fff5fbfe4a0, receiver=0x11774c640, e=0x7fff5fbfcea0) at kernel/qapplication.cpp:2812
#5 0x00000001018bc8ed in QCoreApplication::notifyInternal (this=0x7fff5fbfe4a0, receiver=0x11774c640, event=0x7fff5fbfcea0) at kernel/qcoreapplication.cpp:867
#6 0x000000010002ff7f in QCoreApplication::sendEvent (receiver=0x11774c640, event=0x7fff5fbfcea0) at qcoreapplication.h:232
#7 0x0000000104f73d71 in -[QNSView validAttributesForMarkedText] (self=0x1039d8fc0, _cmd=0x7fff86923d48) at qnsview.mm:1291
#8 0x00007fff8623e211 in -[NSTextInputContext initWithClient:] ()
#9 0x00007fff8623e154 in +[NSTextInputContext inputContextWithClient:] ()
#10 0x00007fff86239eb3 in -[NSView inputContext] ()
#11 0x00007fff861ec809 in -[NSView _setWindow:] ()
#12 0x00007fff8623927c in -[NSView removeFromSuperview] ()
#13 0x00007fff861f4a8c in -[NSWindow setContentView:] ()
#14 0x0000000104f6de2d in QCocoaWindow::clearNSWindow (this=0x1039d8f20, window=0x1039d9270) at qcocoawindow.mm:905
#15 0x0000000104f703ed in QCocoaWindow::~QCocoaWindow (this=0x1039d8f20) at qcocoawindow.mm:253
#16 0x0000000100cd5722 in QWindow::destroy (this=0x1039ba5c0) at kernel/qwindow.cpp:1493
#17 0x000000010014e5c9 in QWidgetPrivate::deleteTLSysExtra (this=0x117735db0) at kernel/qwidget_qpa.cpp:923
#18 0x00000001001508a3 in QWidget::destroy (this=0x117733370, destroyWindow=true, destroySubWindows=true) at kernel/qwidget_qpa.cpp:203
#19 0x000000010012750e in QWidget::~QWidget (this=0x117733370) at kernel/qwidget.cpp:1486
#20 0x00000001003216af in QDialog::~QDialog (this=0x117733370) at dialogs/qdialog.cpp:337
#21 0x00000001003330eb in QFileDialog::~QFileDialog (this=0x117733370) at dialogs/qfiledialog.cpp:426
#22 0x0000000100008fb6 in tst_QGraphicsProxyWidget::bypassGraphicsProxyWidget (this=0x7fff5fbfe490) at tst_qgraphicsproxywidget.cpp:3216

QGestureManager::filterEvent is where the problem is.
I think "receiver" is already deleted.