QProgressDialog does not properly adopt a new progress bar in setBar()

    QPointer<QProgressBar> bar = new QProgressBar;
    QVERIFY(!bar->parent());
    {
        QProgressDialog dlg;

        QVERIFY(!dlg.isAncestorOf(bar));
        dlg.setBar(bar);
        QVERIFY(dlg.isAncestorOf(bar)); // FAIL
    }