bug#71568: 30.0.50; Noto Color Emoji does not work in Emacs for Android

[Jeremy Bryant via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Ant via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> writes:

> Good evening, I've been trying to view emojis on Emacs for Android and
> noticed that colored emojis do not appear, while monochrome emojis do
> appear instead. I've only experimented with Noto Emoji Colore and Noto
> Emojis so far.

Adding Po Lu on this bug report

>
>
> Steps to reproduce:
>
> 1. Install both Noto Emoji (monochrome emojis) and Noto Emoji Color
> (colored emojis) and copy the two .TTF files to ~/fonts
>
> 2. Restart Emacs with -Q
>
> 3. Execute the following
>
> (set-fontset-font t 'emoji '("Noto Color Emoji" . "iso10646-1") nil
> 'prepend)
>
> 4. Try to insert emojis and notice that blank "spaces" are inserted,
> instead
>
> 5. Repeat step 3 but with "Noto Emoji" font and see how the blank spaces
> are filled with the respective monochrome emojis
>
>
> I'm using the latest SourceForge release of Emacs for Android.
>
> If this is not a big but a known limitation known I believe
> it's appropriate to specify it under Android section of the Emacs manual
>
> Thank you in advance!
>
>
>
>
> In GNU Emacs 30.0.50 (build 1, aarch64-unknown-linux-android29) of
>  2024-06-14 built on xeon
> Repository revision: a458dc5dc828cfbe5d74226d6ef45a3d205cb7d8
> Windowing system distributor 'Sony', version 31.0.0
> System Description: Sony/XQ-AS52_EEA/XQ-AS52:12/58.2.A.10.126/058002A010012603718185433:user/release-keys
>
> Configured using:
>  'configure --with-png=yes --with-webp=yes --with-gif=yes
>  --with-jpeg=yes --with-xml2=yes --with-sqlite3=yes --with-gnutls=yes
>  --with-tiff=yes --with-selinux=yes --with-modules=yes
>  --with-tree-sitter=yes --with-imagemagick=no --with-lcms2=yes
>  --with-mailutils= --with-pop=no-by-default --with-harfbuzz=yes
>  --with-threads=yes --with-rsvg=yes --enable-check-lisp-object-type=
>  'CFLAGS=-O2 -Werror=implicit-function-declaration''
>
> Configured features:
> GIF GLIB GMP GNUTLS HARFBUZZ JPEG LIBSELINUX LIBXML2 MODULES NOTIFY
> INOTIFY PDUMPER PNG RSVG SECCOMP SQLITE3 THREADS TIFF TREE_SITTER WEBP
> ZLIB
>
> Important settings:
>   value of $LANG: en_US.utf8
>   locale-coding-system: utf-8-unix
>
> Major mode: Info
>
> Minor modes in effect:
>   diff-hl-margin-mode: t
>   diff-hl-flydiff-mode: t
>   server-mode: t
>   global-org-modern-mode: t
>   text-scale-mode: t
>   beacon-mode: t
>   marginalia-mode: t
>   vertico-mouse-mode: t
>   vertico-multiform-mode: t
>   vertico-mode: t
>   global-form-feed-mode: t
>   repeat-mode: t
>   save-place-mode: t
>   savehist-mode: t
>   global-so-long-mode: t
>   global-auto-revert-mode: t
>   recentf-mode: t
>   override-global-mode: t
>   smart-mark-mode: t
>   delete-selection-mode: t
>   on-screen-global-mode: t
>   pixel-scroll-precision-mode: t
>   tooltip-mode: t
>   global-eldoc-mode: t
>   show-paren-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   modifier-bar-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   isearch-fold-quotes-mode: t
>   context-menu-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   window-divider-mode: t
>   minibuffer-regexp-mode: t
>   buffer-read-only: t
>   line-number-mode: t
>   visual-line-mode: t
>   transient-mark-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   temp-buffer-resize-mode: t
>
> Load-path shadows:
> /data/data/org.gnu.emacs/files/.emacs.d/elpa/transient-20231216.1908/transient hides /assets/lisp/transient
> /data/data/org.gnu.emacs/files/.emacs.d/elpa/landmark-1.0/landmark hides /assets/lisp/obsolete/landmark
>
> Features:
> (shadow sort mixed-pitch mail-extr emacsbug message yank-media puny
> rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util
> text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231
> mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
> mm-util mail-prsvr mail-utils magit-base magit-section crm dash
> info-colors help-fns radix-tree mule-util vertico-directory
> cursor-sensor view ligature display-line-numbers diff-hl-show-hunk
> diff-hl-inline-popup diff-hl-margin diff-hl-dired dired dired-loaddefs
> diff-hl-flydiff diff diff-hl log-view pcvs-util vc-dir ewoc vc
> vc-dispatcher diff-mode track-changes hl-line hl-todo hideshow server
> init org-lazy-babel conf-org doct org-inlinetask warnings org-num
> org-modern org-agenda org-element org-persist xdg org-id org-element-ast
> inline avl-tree generator org-capture org-refile org ob ob-tangle ob-ref
> ob-lob ob-table ob-exp org-macro org-src sh-script smie treesit
> executable ob-comint org-pcomplete pcomplete comint ansi-osc ansi-color
> org-list org-footnote org-faces org-entities time-date org-version
> ob-emacs-lisp ob-core ob-eval org-cycle org-table ol rx org-fold
> org-fold-core org-keys oc org-loaddefs thingatpt advice find-func
> cal-menu calendar cal-loaddefs org-compat org-macs format-spec
> conf-major-modes hydra lv init-eye-candy outline-minor-faces noutline
> outline nano-theme face-remap nano-theme-support disp-table
> all-the-icons all-the-icons-faces data-material data-weathericons
> data-octicons data-fileicons data-faicons data-alltheicons beacon setup
> init-window-buffers init-modeline init-minibuffer marginalia
> vertico-mouse vertico-multiform vertico init-completion orderless
> init-help init-essential form-feed which-key repeat saveplace savehist
> so-long autorevert filenotify recentf tree-widget edmacro kmacro
> cl-extra help-mode bind-key misc-utils easy-mmode smart-mark delsel
> on-screen pixel-scroll cua-base ring no-littering compat
> init-package-list finder-inf os-android cus-edit pp cus-load wid-edit
> ace-window-autoloads adaptive-wrap-autoloads advice-patch-autoloads
> aggressive-indent-autoloads all-the-icons-completion-autoloads
> all-the-icons-dired-autoloads all-the-icons-ibuffer-autoloads
> all-the-icons-autoloads backline-autoloads beacon-autoloads
> calfw-autoloads cape-autoloads cdlatex-autoloads centaur-tabs-autoloads
> cider-autoloads clojure-mode-autoloads consult-dir-autoloads
> consult-eglot-autoloads consult-flyspell-autoloads
> consult-ls-git-autoloads consult-notes-autoloads
> consult-org-roam-autoloads consult-project-extra-autoloads
> consult-yasnippet-autoloads crdt-autoloads crux-autoloads
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> dired-git-info-autoloads dired-toggle-sudo-autoloads doc-toc-autoloads
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> embark-consult-autoloads consult-autoloads embark-autoloads
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> flycheck-eldev-autoloads flycheck-autoloads forge-autoloads
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> elisp-refs-autoloads highlight-indent-guides-autoloads
> ibuffer-project-autoloads ibuffer-sidebar-autoloads ibuffer-vc-autoloads
> info-colors-autoloads inheritenv-autoloads kaolin-themes-autoloads
> autothemer-autoloads landmark-autoloads ligature-autoloads
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> marginalia-autoloads markdown-mode-autoloads math-symbols-autoloads
> minions-autoloads mixed-pitch-autoloads mpv-autoloads
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> no-littering-autoloads nov-autoloads ob-ipython-autoloads
> dash-functional-autoloads ob-mermaid-autoloads olivetti-autoloads
> on-screen-autoloads orderless-autoloads org-appear-autoloads
> org-board-autoloads org-caldav-autoloads org-calibre-notes-autoloads
> org-cliplink-autoloads org-download-autoloads async-autoloads
> org-drill-autoloads org-fragtog-autoloads org-mime-autoloads
> org-modern-autoloads org-mpv-notes-autoloads org-msg-autoloads
> org-notebook-autoloads org-noter-pdftools-autoloads
> org-notifications-autoloads org-notify-autoloads org-pdftools-autoloads
> org-noter-autoloads org-pomodoro-autoloads alert-autoloads
> log4e-autoloads gntp-autoloads org-present-autoloads org-ql-autoloads
> org-recur-autoloads org-ref-autoloads citeproc-autoloads
> bibtex-completion-autoloads biblio-autoloads biblio-core-autoloads
> avy-autoloads htmlize-autoloads f-autoloads org-remark-autoloads
> org-roam-ui-autoloads org-roam-autoloads magit-section-autoloads
> emacsql-autoloads org-special-block-extras-autoloads lolcat-autoloads
> dad-joke-autoloads lf-autoloads org-super-agenda-autoloads
> org-transclusion-autoloads other-frame-window-autoloads
> outline-minor-faces-autoloads ov-autoloads ox-hugo-autoloads
> ox-pandoc-autoloads ht-autoloads ox-reveal-autoloads
> pandoc-mode-autoloads hydra-autoloads lv-autoloads parsebib-autoloads
> parseedn-autoloads parseclj-autoloads pcre2el-autoloads
> pdf-tools-autoloads persist-autoloads pkg-info-autoloads epl-autoloads
> powerline-autoloads queue-autoloads sesman-autoloads setup-autoloads
> simple-httpd-autoloads sketch-mode-autoloads smart-mark-autoloads
> sound-wav-autoloads deferred-autoloads spinner-autoloads
> string-inflection-autoloads svg-tag-mode-autoloads svg-lib-autoloads
> switchy-window-autoloads tablist-autoloads toc-org-autoloads
> tomelr-autoloads transcribe-autoloads transient-autoloads
> transpose-frame-autoloads treepy-autoloads treesit-auto-autoloads
> ts-autoloads s-autoloads vertico-autoloads vundo-autoloads
> web-mode-autoloads websocket-autoloads which-key-autoloads
> windresize-autoloads with-editor-autoloads xr-autoloads
> xref-union-autoloads yaml-autoloads yasnippet-classic-snippets-autoloads
> yasnippet-snippets-autoloads yasnippet-autoloads zone-nyan-autoloads
> esxml-autoloads kv-autoloads zone-rainbow-autoloads
> zone-select-autoloads info dash-autoloads zone-sl-autoloads
> zones-autoloads zop-to-char-autoloads package browse-url url url-proxy
> url-privacy url-expand url-methods url-history url-cookie
> generate-lisp-file url-domsuf url-util mailcap url-handlers url-parse
> auth-source cl-seq eieio eieio-core cl-macs icons password-cache json
> subr-x map byte-opt gv bytecomp byte-compile url-vars cl-loaddefs cl-lib
> early-init doom-lib pcase rmc iso-transl tooltip cus-start cconv eldoc
> paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
> mwheel android-win term/common-win touch-screen ls-lisp tool-bar dnd
> fontset image regexp-opt fringe tabulated-list replace newcomment
> text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
> isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
> font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
> indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
> tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
> romanian slovak czech european ethiopic indian cyrillic chinese
> composite emoji-zwj charscript charprop case-table epa-hook
> jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
> theme-loaddefs faces cus-face macroexp files window text-properties
> overlay sha1 md5 base64 format env code-pages mule custom widget keymap
> hashtable-print-readable backquote threads inotify android multi-tty
> move-toolbar make-network-process emacs)
>
> Memory information:
> ((conses 16 615290 4671154) (symbols 48 31176 1208) (strings 32 164644 110202)
>  (string-bytes 1 4229005) (vectors 16 50540) (vector-slots 8 586902 334414)
>  (floats 8 594 2272) (intervals 56 43891 20944) (buffers 992 14))