QFileSystemWatcher* hangs with QCoreApplication parent

Came across a situation like this:

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    const QString filename("test.file");
    QFileSystemWatcher* watcher = new QFileSystemWatcher(&app);
    watcher->addPaths(QStringList(filename));
    QTimer::singleShot(1000, &app, SLOT(quit()));
    return app.exec();
}

The application deadlocks, since QFileSystemWatcher needs QCoreApplication to stop, but QCoreApplication is already destroyed at that point.

Not using new (QFileSystemWatcher watcher(&app) or just not passing
app as watcher's parent works.

The first method works if QInotifyFileSystemWatcherEngine::stop() is
modified to use quit(); instead of QMetaObject::invokeMethod(this,
"quit");. Application seems to quit cleanly, but maybe it breaks something else?