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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:
+
+* DONE Fix font-hinting =--with-cairo=
+
+Bug#35781 fixed by Yamamoto Mitsuharu.
+
+* TODO 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: 🇪🇺, 🇫🇷
+
+* TODO 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