addMenu problem on Mac

[yycking]

I have a problem about menu.
I can not see menu items when I use some words.
What happen ?

1.png

#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QAction>
 
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
 
    QMainWindow *mainWindow = new QMainWindow;
    mainWindow->setWindowTitle("QMainWindow");    
 
    QMenu *fileMenu = new QMenu("File");
    fileMenu->addAction("Quit", &app, SLOT(quit()), Qt::CTRL + Qt::Key_Q);
    mainWindow->menuBar()->addMenu(fileMenu);
 
    mainWindow->show();
 
    return app.exec();
}

#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QAction>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    
    QMainWindow *mainWindow = new QMainWindow;
    mainWindow->setWindowTitle("QMainWindow");    
    
    QMenu *fileMenu = new QMenu("File");
    fileMenu->addAction("Quit", &app, SLOT(quit()), Qt::CTRL + Qt::Key_Q);
    mainWindow->menuBar()->addMenu(fileMenu);

    mainWindow->show();

    return app.exec();
}

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File menu is not showing when I use "Quit".
If change to "Close" , it will show File menu.
My SDK verson is qt-sdk-mac-opensource-2009.01
2.png

#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QAction>
 
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
 
    QMainWindow *mainWindow = new QMainWindow;
    mainWindow->setWindowTitle("QMainWindow");    
 
    QMenu *fileMenu = new QMenu("File");
    fileMenu->addAction("Close", &app, SLOT(quit()), Qt::CTRL + Qt::Key_Q);
    mainWindow->menuBar()->addMenu(fileMenu);
 
    mainWindow->show();
 
    return app.exec();
}

#include <QApplication>
#include <QMainWindow>
#include <QMenuBar>
#include <QAction>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    
    QMainWindow *mainWindow = new QMainWindow;
    mainWindow->setWindowTitle("QMainWindow");    
    
    QMenu *fileMenu = new QMenu("File");
    fileMenu->addAction("Close", &app, SLOT(quit()), Qt::CTRL + Qt::Key_Q);
    mainWindow->menuBar()->addMenu(fileMenu);

    mainWindow->show();

    return app.exec();
}

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