Re: Support fullscreen values fullheight and fullwidth on pgtk

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: mail@florommel.de,  emacs-devel@gnu.org
> Date: Fri, 08 Jul 2022 14:34:43 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > If this is useful and makes the code clearer and easier to maintain,
> > sure.  But the display-*-p predicates need to be implemented for all
> > the supported frame types, not just for PGTK and X.
> 
> Indeed, but on most other platforms we know beforehand which fullscreen
> parameters are supported, while on X it's actually necessary to ask the
> window manager first.

AFAIU, that just means the implementation on other platforms will be
almost trivial.  My point, though, is that it must have an
implementation for all frame types, no matter how trivial, or else the
predicate isn't worth having.