macosx: workaround for bug where window will vanish if minimized in float-on-top mode
macosx: Fix issue where window vanishes from screen if fullscreen is toggled fast in a row

Extends bool to describe both enter and exit fullscreen transitions.

close #8074
Revert "Qt: remove SPDIF option"

This reverts commit d39285a18cd99fdc76a20fc317074e0ee862a504.

Conflicts:
	modules/gui/qt4/components/simple_preferences.cpp