QDockWidgets of maximized windows are not restored to the correct size when calling QWidget::restoreGeometry() , QMainWindow::restoreState() in a sequence

#include <QtGui>
#if QT_VERSION >= 0x50000
#include <QtWidgets>
#endif

class MainWindow : public QMainWindow
{
public:
	MainWindow()
	{
		setCentralWidget(new QTextEdit(this));
		QDockWidget *dock1 = new QDockWidget(this);
		dock1->setObjectName("First dock");
		dock1->setWidget(new QLabel("Label 1", dock1));
		QDockWidget *dock2 = new QDockWidget(this);
		dock2->setObjectName("Second dock");
		dock2->setWidget(new QLabel("Label 2", dock2));
		addDockWidget(Qt::TopDockWidgetArea, dock1);
		addDockWidget(Qt::TopDockWidgetArea, dock2);
		readSettings();
	}
	void readSettings() {
		QSettings settings("SomeTest", "SaveRestore Example");
		restoreGeometry(settings.value("geometry").toByteArray());
		restoreState(settings.value("windowState").toByteArray());
	}

	void writeSettings()
	{
		QSettings settings("SomeTest", "SaveRestore Example");
		settings.setValue("geometry", saveGeometry());
		settings.setValue("windowState", saveState());
	}

	void closeEvent(QCloseEvent *event)
	{
		QMainWindow::closeEvent(event);
		writeSettings();
	}
};

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