bug#37689: Fringe pixmaps, widgets, etc. look ridiculously tiny in hidpi screen

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  37689@debbugs.gnu.org
> Date: Thu, 10 Oct 2019 16:21:16 +0200
> 
> Perhaps we should convert those pixmaps to some scaleable format, and
> then autoscale them?

You mean, SVG?  We could do that, but we'd like images to display well
even if Emacs cannot display SVG.

Also, I think fringe bitmaps and other icons we use in the UI cannot
be scalable, we need to scale them ourselves.  Not that I'm an expert
on that (so don't take my words as definitive and/or final).