Maximize button doesn't work after ShowMaximized if x coordinate under Mac dockbar

Use Mac dockbar on the left. It doesn't matter is it visible or not. Use application below and try to press green maximize button. There's no effect at all. Change geometry x coordinate out from dockbar geometry and button works.

Test application:

#include <QApplication>
#include <QWidget>

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *w = new QWidget();
	w->setGeometry(0,0,200,200);
	w->showMaximized();
	return app.exec();
}