bug#54188: Crash when eval-ing font test elisp code

[Eli Zaretskii]

> Date: Mon, 28 Feb 2022 09:09:04 +0200
> Cc: 54188@debbugs.gnu.org
> From: Vordoo <vordoo@yahoo.com>
> 
> 3. The code did work nice a couple of times. The crash started after 
> removing/adding fonts to the system. I can try retracing the culprit 
> font, if you find it worthwhile, or just move on.

If you can establish which font causes this, it could allow us to
decide whether and how to deal with this issue.

Thanks.