bug#57141: 29.0.50; Most emoji not displaying in PGTK emacs

[Eli Zaretskii]

> From: Michael Eliachevitch <m.eliachevitch@posteo.de>
> Cc: 57141@debbugs.gnu.org
> Date: Thu, 11 Aug 2022 17:13:32 +0000
> 
>                 position: 523 of 1964 (27%), restriction: <103-1965>, column: > 0
>                 character: 😊 (displayed as 😊) (codepoint 128522, #o373012, 
> #x1f60a)
>                 charset: unicode (Unicode (ISO10646))
>     code point in charset: 0x1F60A
>                 script: emoji
>                 syntax: w     which means: word
>                 category: .:Base
>                 to input: type "C-x 8 RET 1f60a" or "C-x 8 RET SMILING FACE 
> WITH SMILING EYES"
>             buffer code: #xF0 #x9F #x98 #x8A
>                 file code: #xF0 #x9F #x98 #x8A (encoded by coding system 
> utf-8-unix)
>                 display: no font available
                           ^^^^^^^^^^^^^^^^^
This means Emacs cannot find a font for this character.  You need to
figure out why.

> > Do you have Color Note Emoji font installed?
> 
>  "Noto Color Emoji" is in the output of '(font-family-list) ` and it's also 
> installed via my system package manager. Weirdly, if try to change the frame 
> font to "Noto Color Emoji", which I did via the menu-bar "options->set 
> default font", I get the error message
> 
>     set-frame-font: Font not available: #<font-spec nil nil Noto\ Color\ 
> Emoji nil nil normal normal nil 10.0 nil nil nil nil>

This again means Emacs cannot use that font, for some reason.