QGLWidget with QToolBar and OS X fullscreen mode

We can simulate problem on OS X only (I use 10.9.4) where "Fullscreen" button is available. Please use texture example and add toolbar in window constructor:

addToolBar(tr("Toolbar"))->addAction(new QAction(tr("Test"),this));

When you click on Fullscreen button it seems that toolbar height is calculated in wrong way and toolbar is drawn two times vertically .