QAction added to QToolBar ignores setIconText();

//------------------- mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    QAction* act;             //
    QMenu* menu;         //
    QToolBar* toolBar;   //
};
#endif // MAINWINDOW_H
// ---------------- end mainwindow.h

//---------------- mainwindow.cpp
#include "mainwindow.h"

#include <qmenu.h>
#include <qaction.h>
#include <qmenubar.h>
#include <qtoolbar.h>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    menu = new QMenu();
    menu->setTitle("Menu");
    act = new QAction(menu);
    act->setText("normal text");
    act->setIconText("short text");

    menu->addAction(act);

    menuBar()->addMenu(menu);

    toolBar = new QToolBar;
    toolBar->addAction(act);
    addToolBar(toolBar);
}

MainWindow::~MainWindow(){
}
// ----------------- end mainwindow.cpp