bug#50571: 28.0.50; Redisplay segfaults with empty face cache

[Eli Zaretskii]

> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Cc: 50571@debbugs.gnu.org
> Date: Sun, 19 Sep 2021 19:21:12 +0100
> 
> > Thanks for the data.  I guess this is a preview of how allowing
> > arbitrary Lisp that affects the display in fontification-functions
> > will keep shooting in the foot, time and again.
> 
> For that there's M-x kevlar-feet-mode of course, though I'm not sure
> it's GPL-compatible.

Emacs Lisp is way more powerful than any Kevlar.

> > Please try the patch below.
> 
> It seems to relieve the pain in my feet, thank you very much!

Thanks, installed.  And closing the bug (again).