[KevinH]

QGuiApplication inherits from QCoreApplication; and QApplication inherits from QGuiApplication. And our MainApplication inherits from QApplication.

But I think that QCoreApplication does not support gui like opengl but I could be wrong.

These should be static routines otherwise they could not be invoked before creation as is required here.

So unless I am all wet (and I could easily be!) then doing a QGuiApplication::setAttribute call right before MainApplication is created should be allowed.