bug#54441: 28.0.92; set-language-environment causes Apple Color Emoji cannot show up

[Will Chang <will.b.chang@gmail.com>]

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> So it's a "C" (a.k.a. "Posix") language environment, looks like.
> Somewhat strange, but maybe this is "usual" on macOS?

On the previous Emacs Mac Port versions, Emacs doesn't need to set
the code below to enable Emoji and the UTF-8 environment doesn't affect it.

  (set-fontset-font "fontset-default" 'unicode "Apple Color Emoji" nil
'prepend)

Maybe it's a bug on that port, I CC'ed the maintainer Mituharu.


> What happens if you evaluate
>
>   (set-fontset-font "fontset-default" 'unicode "Apple Color Emoji" nil
'prepend)
>
> again, after changing the language environment?

It remains the same.

> AFAICT, this shows that "incorrect" means Emacs uses the Symbola font.

Thanks for the info.

> Does Apple Color Emoji on your system have glyphs for the #x1F300 and
> #x1F600 characters?  Those are the characters we request to be
> supported by a font that is used for emoji.

I believe it has.


Currently, I removed the UTF-8 code and set the Apple Color Emoji font for a
temporary solution.

Again, thanks for your help, I learned a lot with your conversation, you're
so kind. ;)

On Sat, Mar 19, 2022 at 2:53 PM Eli Zaretskii <eliz@gnu.org> wrote:

> [Please use Reply All so that the bug tracker is CC'ed.]
>
> > From: Will Chang <will.b.chang@gmail.com>
> > Date: Sat, 19 Mar 2022 11:06:06 +0800
> >
> > >does this happen in "emacs -Q", if you evaluate the above
> > immediately upon entering Emacs?
> >
> > Yes. Tested it on:
> > "GNU Emacs 28.0.92 (build 2, x86_64-apple-darwin21.4.0, Carbon Version
> 165
> > AppKit 2113.4)
> >  of 2022-03-18"
> > "GNU Emacs 28.0.92 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60
> > Version 10.14.6 (Build 18G95))
> >  of 2022-03-14"
> >
> > > what is the language environment before the evaluation of
> >     set-language-environment above?
> >
> > I run describe-language-environment and got:
> >
> > English language environment
> >
> > Nothing special is needed to handle English.
> >
> > Sample text:
> >   Hello!, Hi!, How are you?
> >
> > Input methods:
> >   programmer-dvorak ("DVP@" in mode line)
> >   english-dvorak ("DV@" in mode line)
> >
> > Character sets:
> >   ascii: ASCII (ISO646 IRV)
> >
> > Coding systems:
> >   nothing specific to English
>
> So it's a "C" (a.k.a. "Posix") language environment, looks like.
> Somewhat strange, but maybe this is "usual" on macOS?
>
> > > what is the output of "M-x describe-fontset RET fontset-default RET"
> >     after evaluating set-language-environment, in particular in the
> >     Emoji block starting from #x1F600?
> >
> > 😀 .. 🙏 (#x1F600 .. #x1F64F)
> >     -*-Apple Color Emoji-*-*-*-*-*-*-*-*-*-*-*-*
> >     -*-Noto Color Emoji-*-*-*-*-*-*-*-*-*-*-iso10646-1
> >     -*-Symbola-*-*-*-*-*-*-*-*-*-*-iso10646-1
> > [-*-Symbola-normal-normal-semicondensed-*-12-*-*-*-p-0-iso10646-1]
>
> It sounds like Emacs used Symbola, although Apple Color Emoji is in
> the list, and is first in the list.  Which probably means Emacs
> examined Apple Color Emoji and rejected it for some reason.
>
> What happens if you evaluate
>
>   (set-fontset-font "fontset-default" 'unicode "Apple Color Emoji" nil
> 'prepend)
>
> again, after changing the language environment?
>
> > >what did you mean by "emoji doesn't show up correctly"? how was it
> >     displayed "incorrectly"?
> >
> > The screenshots:
> > - default: https://i.imgur.com/jLcwEDk.png
> > - English with fontset(correctly): https://i.imgur.com/qgqhCHF.png
> > - UTF-8 with fontset: https://i.imgur.com/tkjOVGv.png
>
> AFAICT, this shows that "incorrect" means Emacs uses the Symbola font.
>
> Does Apple Color Emoji on your system have glyphs for the #x1F300 and
> #x1F600 characters?  Those are the characters we request to be
> supported by a font that is used for emoji.
>

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