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Support for color fonts [[https://lists.gnu.org/archive/html/emacs-devel/2019-04/msg00996.html][has landed]] on version 27.0 (master).
Remaining issues:
* Fix font-hinting =--with-cairo=
See bug#35781. Potentially useful reading:
- https://bugs.freedesktop.org/show_bug.cgi?id=11838
- https://unix.stackexchange.com/questions/321857/why-is-xft-ignoring-font-settings
* Check whether combining sequences work
For example:, regional flags, ZWJ sequences from
- ZWJ sequences from
<https://unicode.org/emoji/charts/emoji-zwj-sequences.html>:
- 🧟♂️, 🧟♀️
- 🐕🦺
- regional indicators: 🇪🇺, 🇫🇷
* Add a convenient way to set a font for all emojis
AFAICT there is no convenient way to =set-fontset-font= e.g. Noto
Color Emoji for "all emojis"; valid TARGETs for this function are
- single characters
- character ranges
- scripts, as defined in =script-representative-chars=
- charsets
- nil = any character not already covered by another font-spec
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