bug#47074: Replace XPM icons with Unicode codepoints in customize/widgets

[Alan Third <alan@idiocy.org>]

On Sun, Mar 14, 2021 at 08:49:30PM +0200, Eli Zaretskii wrote:
> > From: Stefan Kangas <stefan@marxist.se>
> > Date: Sun, 14 Mar 2021 13:44:32 -0500
> > Cc: Eli Zaretskii <eliz@gnu.org>, 47074@debbugs.gnu.org
> > 
> > This is exactly the behavior I was thinking of, yes.  It looks and works
> > great in some minor testing.
> > 
> > Maybe Lars or Eli have additional comments, but LGTM.
> 
> The only question I have is what will happen if librsvg is older than
> 2.48?

It will work exactly as it works at the moment. The font size will be
set to the librsvg default, which I think is 16 pixels, so the images
will default to 16 pixels high.

The problem is that librsvg only provided the ability to set a
stylesheet in 2.48, for earlier versions we'd have to wrap the SVG,
similar to what we do at the moment for resizing, but we'd have to
wrap twice with two different wrappers (once to get the original size,
and once to generate the resized image). I'm not actually sure whether
we can reliably get the size of a wrapped image. I'll have to try it I
suppose.

It looks like the stylesheet change was only merged in last year, I
was forgetting this was added so recently.
-- 
Alan Third