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

[Yuan Fu]

> On Oct 7, 2021, at 10:38 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 7 Oct 2021 13:13:28 -0700
>> Cc: Kenichi Handa <handa@gnu.org>,
>> 49797@debbugs.gnu.org
>> 
>>>>     if (face->ascii_face->font)
>>>>    {
>>>>      XSETFONT (font_object, face->ascii_face->font);
>>>>      if (font_has_char (f, font_object, c))
>>>>        return face->ascii_face->id;
>>>>    }
>>> 
>>> No, this is where we try to use the ASCII font for symbols and
>>> punctuation characters.
>> 
>> You are right.
>> 
>>> 
>>>> And what about the comment I mentioned? Did you read it?
>>> 
>>> Yes, but it has no relevance to the issue at hand.  That whole part is
>>> about displaying symbol and punctuation characters.
>> 
>> It IMO reveals the writer’s intent that fontset can be used to force a face 
>> to display certain characters with certain font.
> 
> I don't see how you arrived at that conclusion.  What the above
> snippet does is simply check whether the face's font used for the
> ASCII characters (which is the default font of the face) is capable of
> displaying the given symbol or punctuation character, and if so, it
> uses that default font instead of consulting the fontset (where symbol
> and punctuation characters could be assigned to a different font).
> There's no reference or usage of any fontset in this code snippet.

Maybe you are right.

Yuan