Re: master cc29fab3a6: Redisplay "invisible" frames that are actually visible on modern X

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: luangruo@yahoo.com,  emacs-devel@gnu.org
> Date: Tue, 27 Dec 2022 10:29:19 -0500
> 
> >> FWIW, while this sounds about right for `icon`ified frames, for those
> >> frames that are marked as actually invisible, I think we should try and
> >> keep them as invisible as possible.
> >
> > I'm not sure I agree.  I believe this could belong to some new GUI
> > ideas (all of which are invariably copy-cat'ed from MS-Windows ;-),
> > whereby you have a means of showing a small-but-still-readable image
> > of an otherwise invisible frame, e.g., by hovering the mouse above
> > some desktop icon or widget.
> 
> If there's some representation of that frame somewhere on the screen,
> then I think it belongs in the `icon`ified state, not the
> `invisible` state.

You'd be surprised how visible can "invisible" frames be, on some
modern desktops.

> Rather than rely on "optional feature", would it be possible to rely on
> "expose events" to detect when an iconified frame needs to be updated?

I'm not sure such events are delivered in these cases, but Po Lu will
probably know.