bug#68467: 29.1; Fringe fonts + hidpi

[Samuel Kyletoft <samuel@kyletoft.se>]

I had a very vim-mindset when writing the initial report and didn't
even consider that it could be an image rather than a character
in a custom font. But yes, I guess I do mean the bitmaps. But setting
`(set-face-attribute 'fringe nil :font "Cascadia Code" :height 220)`
will scale it correctly, so it can scale it if set explicitly, it just won't
do it automatically.

On Sat, 20 Jan 2024 at 11:29, Po Lu <luangruo@yahoo.com> wrote:
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> >> From: Samuel Kyletoft <samuel@kyletoft.se>
> >> Date: Mon, 15 Jan 2024 06:49:56 +0100
> >>
> >> I use Emacs at 200% on xwayland in GNOME. Most things respect the 200%
> >> scaling without any configuration, but not the fringe font. See
> >> attached screenshots at 100% and 200% scale.
> >> To reproduce: Open Emacs on a 200% monitor, use any package that
> >> annotates the fringe.
> >
> > Po Lu, any suggestions?
> >
> > Thanks.
>
> What is the "fringe font" in this context?  If by that you (Samuel) mean
> the size of individual fringe bitmaps, then the reason it cannot scale
> is that the code for magnifying fringe bitmaps by the display scale
> factor has yet to be written.  PGTK and NS builds are unaffected by this
> deficiency because the toolkit assumes responsibility for doing so.
>
> Thanks.