FreeCAD 3D View is often somewhat dark even if the UI is in light
colors. So if user has not speficially applied "Light" stylesheet we
should prefer to use "Dark-Outline" stylesheet which provides proper and
fully transparent overlay panels.
* QMetaObject::invokeMethod: No such method Gui::OverlayManager::raiseAll()
* variable 'total' set but not used [-Wunused-but-set-variable]
* 'globalPos' is deprecated: Use globalPosition() [-Wdeprecated-declarations]
