bug#44316: 26.3; Faces `fixed-pitch' and `fixed-pitch-serif' are opposite what they should be

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Fri, 30 Oct 2020 14:48:00 +0100
> Cc: 44316@debbugs.gnu.org
> 
> Stefan Kangas <stefankangas@gmail.com> writes:
> 
> > I'm also on Debian bullseye.  I wonder what causes the different things
> > we are seeing.  Sounds likely that we have different font related
> > packages installed, right?
> 
> Yup.  This is with "emacs -Q", by the way, which I failed to mention
> the last time, but it seems like I'm getting the same in my normal Emacs.

I think one part of the problem here is that "Mono" family (which is
what fixed-pitch uses) doesn't say whether the result will be with or
without serifs.  So you can get a font either with or without the
serifs, depending on what fonts are installed and perhaps also on some
local configuration.

The other part of the problem, which could be Windows-specific, is
that the MS-Windows font back-ends don't know about "Mono Serif"
family.  Do you always get a font with serifs when the family is "Mono
Serif"?  If so, we could perhaps teach MS-Windows do the same.  But
the result might be that both faces get the same font -- are we okay
with that?  One place where that could matter is in Info.