QQuickRenderControl destructor breaks deleteLater

Under normal conditions it should be safe to rely on deleteLater() to not be processed until we hit the event loop

HoweverQQuickRenderControlPrivate::windowDestroyed contains the line

        QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);

which gives very strange behaviour in client code.This will crash at the second debug statement

    auto obj = new QObject(this);
    obj->setProperty("DAVE", "DAVE");
    obj->deleteLater();
    qDebug() << obj->property("DAVE");
    {
        QQuickRenderControl c;
        QQuickWindow w(&c);
    }
    qDebug() << obj->property("DAVE");

Guarding all possible usage of objects that might be used in the same event as the destruction of a QQuickwindow in a render control simply isn't feasible.