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bug#39799: 28.0.50; Most emoji sequences don’t render correctly

From: Robert Pluim
Subject: bug#39799: 28.0.50; Most emoji sequences don’t render correctly
Date: Fri, 28 Feb 2020 21:38:07 +0100

>>>>> On Fri, 28 Feb 2020 22:13:14 +0200, Eli Zaretskii <address@hidden> said:

    >> (set-fontset-font nil #x24c2
    >> '("Noto Color Emoji" . "iso10646-1") nil
    >> 'prepend)
    >> in the frame displaying the character, then it does use Noto Color
    >> Emoji. What am I missing?

    Eli> Which part makes the difference: the "fontset-default" vs nil or
    Eli> symbol-subgroup vs an explicit codepoint?

symbol-subgroup in that context is (#x2460 . #x24FF)    ;; Enclosed
so I suspect it's the nil rather than "fontset-default". <time passes>

     (set-fontset-font nil '(#x2460 . #x24FF)
     '("Noto Color Emoji" . "iso10646-1") nil

Makes the character display using Noto Color Emoji.

     (set-fontset-font "fontset-default" '(#x2460 . #x24FF)
     '("Noto Color Emoji" . "iso10646-1") nil

gives me:

Debugger entered--Lisp error: (error "Fontset ‘default-fontset’ does not exist")
  set-fontset-font("default-fontset" (9312 . 9471) ("Noto Color Emoji" . 
"iso10646-1") nil prepend)
  (progn (set-fontset-font "default-fontset" '(9312 . 9471) '("Noto Color 
Emoji" . "iso10646-1") nil 'prepend))
  eval((progn (set-fontset-font "default-fontset" '(9312 . 9471) '("Noto Color 
Emoji" . "iso10646-1") nil 'prepend)) t)
  funcall-interactively(eval-last-sexp nil)
  call-interactively(eval-last-sexp nil nil)

and similarly if I specify a single character rather than a
range. Using 't' instead of "default-fontset" doesnʼt error, but
doesnʼt cause any font changes either.


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