bug#45198: 28.0.50; Sandbox mode

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: 45198@debbugs.gnu.org,  bzg@gnu.org,  joaotavora@gmail.com
> Date: Sat, 12 Dec 2020 16:06:54 -0500
> 
> > You cannot usefully call error from redisplay.
> 
> Hmm... but this is at the entrance to redisplay, so I though it should
> still be safe at that point.  If it's a problem we can replace the above
> with
> 
>     if (emacs_is_sandboxed)
>       return;

Yes, I think this is what we should do in this case.