QPushButton: incorrect placement of icon and menu

#include <QtGui>

#define ICON QIcon::fromTheme("edit-cut")

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

    QWidget w;

    QVBoxLayout *vlay = new QVBoxLayout(&w);
    QHBoxLayout *hlay;
    QPushButton *pb;
    QMenu *m;

    hlay = new QHBoxLayout;
    vlay->addLayout(hlay);
    pb = new QPushButton(QString("this is button 1"), &w);
    hlay->addWidget(pb);
    hlay->addStretch(1);


    hlay = new QHBoxLayout;
    vlay->addLayout(hlay);
    pb = new QPushButton(QString("this is button 2"), &w);
    pb->setIcon(QIcon(ICON));
    hlay->addWidget(pb);
    hlay->addStretch(1);

    hlay = new QHBoxLayout;
    vlay->addLayout(hlay);
    pb = new QPushButton(QString("this is button 3"), &w);

    m = new QMenu(&w);
    m->addAction(QString("Action 1"));
    m->addAction(QString("Action 2"));
    m->addAction(QString("Action 3"));
    pb->setMenu(m);

    hlay->addWidget(pb);
    hlay->addStretch(1);

    hlay = new QHBoxLayout;
    vlay->addLayout(hlay);
    pb = new QPushButton(QString("this is button 4"), &w);
    pb->setIcon(QIcon(ICON));

    m = new QMenu(&w);
    m->addAction(QString("Action 1"));
    m->addAction(QString("Action 2"));
    m->addAction(QString("Action 3"));

    pb->setMenu(m);
    hlay->addWidget(pb);
    hlay->addStretch(1);

    w.show();
    return app.exec();
}