bug#67794: 30.0.50; mouse-face is not respected on SVG images

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: gerd.moellmann@gmail.com,  alan@idiocy.org,  67794@debbugs.gnu.org
> Date: Thu, 14 Dec 2023 10:48:23 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I guess it's possible, but it requires changes in how the display code
> > works:
> >
> >   . when we generate glyphs, we currently pay no attention to
> >     mouse-face properties, only to face properties
> >   . image glyphs will need to store 2 image IDs, not 1, and use the
> >     appropriate one in each case
> 
> Ok and do you think this is a good enough design?  Or should we do it
> differently?

Sounds okay to me to try that, but there could always be surprises in
that area.