Qt 5 to-do in QGraphicsWidget

qtbase/src/widgets/graphicsview/qgraphicswidget.h contains the following Qt 5 to-do comment:

    // ### Qt 5: Disambiguate
#ifdef Q_NO_USING_KEYWORD
    const QObjectList &children() const { return QObject::children(); }
#else
    using QObject::children;
#endif

If this can be handled without breaking source-compatibility, it should be actioned for Qt 5.0.0. If not, it should be removed or changed to a Qt 6 to-do.