QPushButton's text is clipped when adding an icon and set a QMenu to it

#include <QtWidgets>

int main(int argc, char *argv[]) 
{ 
  QApplication a(argc, argv); 
  auto popupButton = new QPushButton(); 
  popupButton->setText("Popup Button With Menu and Icon"); 
  popupButton->setIcon(QPixmap(QLatin1String(":/qt-project.org/qmessagebox/images/qtlogo-64.png"))); 
  auto menu = new QMenu(); 
  menu->addAction("&First Item"); 
  menu->addAction("&Second Item"); 
  popupButton->setMenu(menu); 
  auto popupButton2 = new QPushButton();
  popupButton2->setText("Popup Button With Menu and Icon");
  popupButton2->setIcon(QPixmap(QLatin1String(":/qt-project.org/qmessagebox/images/qtlogo-64.png")));
  auto dlg = new QDialog;
  auto *layout = new QHBoxLayout(dlg);
  layout->addWidget(popupButton);
  layout->addWidget(popupButton2);
  layout->addSpacerItem(new QSpacerItem(20,20,QSizePolicy::Expanding, QSizePolicy::Preferred)) ; 
  dlg->show() ;
  return a.exec();
}