[REG] QGraphicsItem with parent flag ItemClipsChildrenToShape not visible.

#include <QtGui>
int main( int argc, char * argv[])
{
    QApplication app( argc, argv );

    QGraphicsScene scene;
    QGraphicsRectItem *parent = new QGraphicsRectItem(QRectF(0,0, 50, 50), 0);
    parent->setBrush(Qt::red);
    QGraphicsRectItem *child = new QGraphicsRectItem(QRectF(-10,-10, 40, 40), parent);
    child->setBrush(Qt::blue);

    QGraphicsRectItem *ignore = new QGraphicsRectItem(QRectF(60, 60, 50, 50), 0);
    ignore->setBrush(Qt::green);

    //comment either of those two lines to make it work
    parent->setFlags( QGraphicsItem::ItemClipsChildrenToShape );
    ignore->setFlag(QGraphicsItem::ItemIgnoresTransformations);

    scene.addItem(parent);
    scene.addItem(ignore);

    QGraphicsView view( &scene );
    view.show();
    return app.exec();
}