wayland: Make fullscreen mode updates async
Currently, the fullscreen state is update synchronously, but it needs to be done in asynchronous fashion.
This change removes some tests as they don't add any value, testFullscreen() covers them all.
Currently, the fullscreen state is update synchronously, but it needs to be done in asynchronous fashion.
This change removes some tests as they don't add any value, testFullscreen() covers them all.