Wrong Cursor when widget become native. on X11

#include <QtGui>


struct O : public QObject
{Q_OBJECT
public slots:
    void slotFoo() {
        qDebug() << b2->winId();
    }
public: 
    QPushButton *b2;
};


int main(int argc, char** argv)
{
    QApplication a(argc, argv);


    QWidget w;
    w.setObjectName("toplevel");
    QVBoxLayout *l = new QVBoxLayout(&w);
    w.setLayout(l);
    QPushButton *b1 = new QPushButton("b1", &w);
    b1->setObjectName("b1");
    l->addWidget(b1);
    QPushButton *b2 = new QPushButton("b2", &w);
    l->addWidget(b2);
    b2->setObjectName("b2");
    b2->setCursor(Qt::PointingHandCursor);

    O o;
    o.b2 = b2;
    QObject::connect(b2, SIGNAL(clicked()), &o, SLOT(slotFoo()));

    w.show();

    return a.exec();
}

#include "main.moc"