(Will followup with an updated patch as soon as I get a bug number.)

FWIW, I found out about this block after

- hearing that Unicode 13.0 included new emojis,
- waiting for an updated version of Symbola to be released[4],
- trying to insert some of the new emojis in Emacs,
- noticing that some of them (e.g. 🩴 U+1FA74, 🪗 U+1FA97, 🫕 U+1FAD5)
  are not displayed (C-u C-x = says "display: no font available",
  despite Symbola covering them).
- going straight to fontset.el to understand why Symbola wasn't picked
  automatically.

Of course, users can work around this with:

    (set-fontset-font t '(#x1FA70 . #x1FAFF) "Symbola" nil 'append)

Thank you for your time.


[1] https://www.unicode.org/charts/PDF/Unicode-13.0/U130-1FA70.pdf
[2] https://en.wikipedia.org/wiki/Symbols_and_Pictographs_Extended-A
[3] https://dn-works.com/wp-content/uploads/2020/UFAS-Docs/Symbola.pdf
    p.14
[4] https://dn-works.com/ufas/


In GNU Emacs 28.0.50 (build 32, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
 of 2020-05-30 built on my-little-tumbleweed
Repository revision: 780f674a82a90c4e3e32583059b498bfa57e4a06
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: openSUSE Tumbleweed

Configured using:
 'configure --with-xwidgets --with-cairo'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix