bug#54843: 29.0.50; rcirc-omit-mode hiding the overlay arrow

[Davide Masserut]

New messages are usually indicated by the overlay arrow.

When `rcirc-omit-mode' is enabled, the arrow doesn't appear if the previous 
message
is omitted (by default "JOIN", "PART", "QUIT", "NICK" messages) but the
mark to the first unread message is still set.

Steps to reproduce:

(add-hook 'rcirc-mode-hook #'rcirc-omit-mode)
(add-hook 'rcirc-mode-hook #'rcirc-track-minor-mode) ; optional
(setq rcirc-server-alist '(("irc.libera.chat" :channels
                           ("#emacs" "#libera" "#linux") ; active channels
                           :port 6697 :encryption tls)))
(rcirc nil)

Then:
- wait for new messages to arrive
- switch to the channel buffer
  (with C-c C-SPC if `rcirc-track-minor-mode' is enabled)
- jump to the first unread message with C-c C-a
- check if the arrow is there 

To see omitted messages set `rcirc-debug-flag' to t before calling
`rcirc' or start another irc client without enabling
`rcirc-omit-mode' or similar features and join the same channels.


In GNU Emacs 29.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo 
version 1.17.6)
 of 2022-04-09 built on T480s
Repository revision: 8b3748c234e8be8c2b34c263cb216fef5a5f2279
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --without-libotf --without-m17n-flt
 --without-gconf --without-gsettings --with-native-compilation
 --with-xinput2 --with-pgtk --without-xaw3d --with-sound=no
 --without-gpm --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=native -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -g
 -ffile-prefix-map=/home/davide/src/emacs-git/src=/usr/src/debug'
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ JPEG JSON LCMS2
LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK PNG
RSVG SECCOMP SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: it_IT.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  rcirc-track-minor-mode: t
  global-tree-sitter-mode: t
  dired-hist-mode: t
  electric-pair-mode: t
  recentf-mode: t
  save-place-mode: t
  global-diff-hl-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  which-key-mode: t
  global-auto-revert-mode: t
  repeat-mode: t
  pixel-scroll-precision-mode: t
  undo-hl-mode: t
  display-line-numbers-mode: t
  display-fill-column-indicator-mode: t
  flymake-mode: t
  rainbow-delimiters-mode: t
  highlight-parentheses-mode: t
  corfu-global-mode: t
  corfu-mode: t
  marginalia-mode: t
  savehist-mode: t
  vertico-mouse-mode: t
  vertico-mode: t
  minibuffer-depth-indicate-mode: t
  global-so-long-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
~/src/undo-hl/undo-hl hides /home/davide/.emacs.d/elpa/undo-hl-1.0/undo-hl
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-draft hides 
/usr/share/emacs/site-lisp/notmuch-draft
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-compat hides 
/usr/share/emacs/site-lisp/notmuch-compat
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-jump hides 
/usr/share/emacs/site-lisp/notmuch-jump
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-mua hides 
/usr/share/emacs/site-lisp/notmuch-mua
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-message hides 
/usr/share/emacs/site-lisp/notmuch-message
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-tag hides 
/usr/share/emacs/site-lisp/notmuch-tag
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-query hides 
/usr/share/emacs/site-lisp/notmuch-query
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-print hides 
/usr/share/emacs/site-lisp/notmuch-print
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-maildir-fcc hides 
/usr/share/emacs/site-lisp/notmuch-maildir-fcc
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-address hides 
/usr/share/emacs/site-lisp/notmuch-address
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-parser hides 
/usr/share/emacs/site-lisp/notmuch-parser
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-show hides 
/usr/share/emacs/site-lisp/notmuch-show
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-wash hides 
/usr/share/emacs/site-lisp/notmuch-wash
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-hello hides 
/usr/share/emacs/site-lisp/notmuch-hello
/home/davide/.emacs.d/elpa/notmuch-0.35/coolj hides 
/usr/share/emacs/site-lisp/coolj
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-lib hides 
/usr/share/emacs/site-lisp/notmuch-lib
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-tree hides 
/usr/share/emacs/site-lisp/notmuch-tree
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch hides 
/usr/share/emacs/site-lisp/notmuch
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-company hides 
/usr/share/emacs/site-lisp/notmuch-company
/home/davide/.emacs.d/elpa/notmuch-0.35/notmuch-crypto hides 
/usr/share/emacs/site-lisp/notmuch-crypto
/home/davide/.emacs.d/elpa/transient-20220406.1156/transient hides 
/usr/share/emacs/29.0.50/lisp/transient

Features:
(shadow sort company-oddmuse company-keywords company-etags
company-gtags company-dabbrev-code company-dabbrev company-files
company-clang company-capf company-cmake company-semantic
company-template company-bbdb mail-extr emacsbug ox-odt rng-loc rng-uri
rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar org-agenda org-refile
ox-html table ox-ascii ox-publish ox scroll-lock expand-region
text-mode-expansions cc-mode-expansions the-org-mode-expansions
python-el-fgallina-expansions er-basic-expansions expand-region-core
expand-region-custom rainbow-mode xterm-color conf-mode flymake-cc
consult-icomplete icomplete diff-hl-dired matlab-cgen tempo
consult-imenu tabify man cus-edit cus-start cus-load etags fileloop
notmuch notmuch-tree notmuch-jump notmuch-hello notmuch-show
notmuch-print notmuch-crypto notmuch-mua notmuch-message notmuch-draft
notmuch-maildir-fcc notmuch-address notmuch-company notmuch-parser
notmuch-wash coolj notmuch-query icalendar diary-lib diary-loaddefs
notmuch-tag notmuch-lib notmuch-version notmuch-compat debug
consult-xref grep xref cl-print timer-list novice helpful trace edebug
backtrace info-look f elisp-refs help-fns misearch multi-isearch ibuffer
ibuffer-loaddefs goto-addr bug-reference autoload radix-tree mm-archive
face-remap magit-extras magit-bookmark magit-submodule magit-obsolete
magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull
magit-fetch magit-clone magit-remote magit-commit magit-sequence
magit-notes magit-worktree magit-tag magit-merge magit-branch
magit-reset magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log which-func imenu magit-diff smerge-mode
diff git-commit log-edit add-log magit-core magit-autorevert
magit-margin magit-transient magit-process with-editor magit-mode
transient magit-git magit-base magit-section crm url-http url-gw
url-cache url-auth hl-line cdlatex texmathp org-indent image-file
image-converter org-element ol-eww eww xdg mm-url ol-rmail ol-mhe ol-irc
ol-info ol-gnus nnselect gnus-art mm-uu mml2015 mm-view mml-smime smime
dig gnus-sum gnus-group gnus-undo gnus-start gnus-dbus dbus gnus-cloud
nnimap nnmail mail-source utf7 netrc nnoo gnus-spec gnus-int gnus-range
gnus-win gnus nnheader range ol-docview doc-view jka-compr image-mode
exif ol-bibtex ol-bbdb ol-w3m ol-doi org-link-doi org-mouse elfeed-org s
dash ob-shell shell ob-python python ob-gnuplot ob-ditaa ob-C cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-footnote org-src ob-comint org-pcomplete pcomplete org-list
org-faces org-entities noutline outline org-version ob-emacs-lisp
ob-core ob-eval org-table oc-basic bibtex ol org-keys oc org-compat
advice org-macs org-loaddefs format-spec find-func cal-menu calendar
cal-loaddefs elfeed-show elfeed-search message sendmail yank-media
rfc822 mml mml-sec gnus-util mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev
mail-utils gmm-utils mailheader shr pixel-fill kinsoku svg dom
elfeed-csv elfeed elfeed-curl elfeed-log elfeed-db elfeed-lib avl-tree
generator url-queue url-file url-dired xml-query xml rcirc-menu
hippie-exp company-yasnippet vc-mtn vc-hg vc-bzr vc-src vc-sccs vc-svn
vc-cvs vc-rcs vc-git matlab matlab-scan matlab-syntax matlab-compat
embark-consult consult-vertico consult disp-table gnutls network-stream
puny nsm rmc rcirc-color rcirc epa-file epa derived epg rfc6068
epg-config parse-time iso8601 vertico-directory char-fold mule-util
cursor-sensor vertico-repeat tree-sitter-langs tree-sitter-langs-build
tar-mode arc-mode archive-mode tree-sitter-hl tree-sitter
tree-sitter-load tree-sitter-cli tsc tsc-dyn tsc-dyn-get dired-aux
dired-hist dired-x dired dired-loaddefs tsc-obsolete elec-pair embark
ffap ace-link avy recentf tree-widget wid-edit saveplace-pdf-view
bookmark pp saveplace company auth-source-pass diff-hl log-view
pcvs-util vc-dir ewoc vc vc-dispatcher diff-mode yasnippet-snippets
yasnippet which-key autorevert filenotify repeat pixel-scroll cua-base
undo-hl pulse color iedit iedit-lib server display-line-numbers
display-fill-column-indicator time-date checkdoc lisp-mnt flymake-proc
flymake project compile text-property-search comint ansi-color ring
thingatpt rainbow-delimiters highlight-parentheses delight finder-inf
cape corfu marginalia savehist orderless vertico-mouse vertico edmacro
kmacro modus-vivendi-theme modus-operandi-theme modus-themes
no-littering comp comp-cstr warnings rx cl-extra help-mode mb-depth
so-long use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core tex-site info package browse-url url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util mailcap url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache json map url-vars seq
gv subr-x byte-opt bytecomp byte-compile cconv cl-loaddefs cl-lib pcase
iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks
lisp-float-type elisp-mode mwheel term/pgtk-win pgtk-win term/common-win
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
simple cl-generic 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 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 dbusbind inotify dynamic-setting font-render-setting cairo gtk
pgtk lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 2989949 527679)
 (symbols 48 58328 5)
 (strings 32 529101 94588)
 (string-bytes 1 32670177)
 (vectors 16 151986)
 (vector-slots 8 3099296 315632)
 (floats 8 4276 12424)
 (intervals 56 283208 88)
 (buffers 992 81))