bug#28872: 26.0.90; non-native-fullscreen does not play well with ns-transparent-titlebar on macOS

[martin rudalics]

> In order to use lisp to do the fullscreen thing we’d need to keep
> track of various ‘windowed’ frame parameters, ie. undecorated, width,
> height, origin, maybe others. I assume it would be OK to stick them
> into the frame-parameters alist under a special key, so we know where
> they are when we want to switch back.

We might need the 'original-width' and 'original-height' values for
other platforms as well.  I'm still not happy about our current
implementation of fullscreen.  But what is the 'origin' parameter?

martin