bug#49797: 28.0.50; Setting face to custom fontset doesn't work

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Tue, 5 Oct 2021 10:31:59 -0700
> Cc: Kenichi Handa <handa@gnu.org>,
>  49797@debbugs.gnu.org
> 
> Basically, Emacs doesn’t do what it claims to do in the manual, see below for 
> more explanation.

It isn't the first time, and the solution could be to fix the docs.

> I just want to use different CJK fonts for different faces.

Why do you need that?  And why specifically for CJK?

> I think you would agree that, for non-Latin speakers, using different fonts 
> for different faces (for non-Latin) characters is an important feature.

No, I don't think I understand why.

And the usual way to do this is to request a font family or foundry in
the face spec, not via fontsets.  Doesn't that work for some reason?