After selecting full-screen (either via main-menu or with ctrl+shift+f11) the drop down windows of the main menu do not become visible. So it's not possible to select any of the menu items. Additionally no Auto-Completition neither in C++ nor in Qml documents works. After going back to normal screen size with ctrl+shift+f11 everthing works fine.
Ok for Qt 5.7.0
Not Ok for 5.7.1, 5.8.0