#include <QtWidgets>

#define WORKAROUND 0

class MainWindow : public QMainWindow
{
public:
    MainWindow()
        : settings("ACME inc" "Test App")
    {
        // Add a menu:
        menuBar()->addMenu("?")->addAction("About", qApp, SLOT(aboutQt()));
    
        // Add a dock widget:
        QDockWidget* dock = new QDockWidget("Dock");
        dock->setObjectName("Dock");
        addDockWidget(Qt::LeftDockWidgetArea, dock);

        // Add a central widget
        setCentralWidget(new QTextEdit);

#if !WORKAROUND
        restoreGeometry(settings.value("geometry").toByteArray());
        restoreState(settings.value("state").toByteArray());
    }
#else
    }
    void showEvent(QShowEvent*)
    {
        static bool first = true;
        if (first)
        {
            restoreGeometry(settings.value("geometry").toByteArray());
            restoreState(settings.value("state").toByteArray());
        }
    }
#endif
    ~MainWindow()
    {
        settings.setValue("geometry", saveGeometry());
        settings.setValue("state", saveState());
    }
    QSettings settings;
}; 

int main (int argc, char* argv[]) 
{
    QApplication app(argc, argv);
    MainWindow mw;
    mw.show();
    return app.exec();
}