bug#48341: 28.0.50; naming nnselect group fails on exit

[Jose A. Ortega Ruiz]

- Use a Gnus configuration where the name of the server is not show in
  the Groups buffer. E.g., i use:
      (setq gnus-group-line-format " %m%S%p%3y%P%* %~(pad-right 45)G %B\n")
  and, if, for instance, a group is named "nnselect:foo", its name in
  the groups buffer is just "foo".
- Perform any search in the Groups buffer with G G
- After entering the results group, name it with C-c C-p
- Try exiting the group. One gets an error:
    Debugger entered--Lisp error: (wrong-type-argument stringp nil)
     string-match("^[^:]+:" nil)
     gnus-activate-group(nil)
     gnus-list-of-unread-articles(nil)
     nnselect-push-info("nnselect:nnselect-87im3qujhz.fsf")
     nnselect-close-group("nnselect-87im3qujhz.fsf" "")
     gnus-close-group("nnselect:nnselect-87im3qujhz.fsf")
     gnus-summary-exit()
     funcall-interactively(gnus-summary-exit)
     call-interactively(gnus-summary-exit nil nil)
     command-execute(gnus-summary-exit)

Thanks!
jao


In GNU Emacs 28.0.50 (build 9, x86_64-pc-linux-gnu, X toolkit, cairo version 
1.16.0)
 of 2021-05-11 built on osgiliath
Repository revision: 28bed069a7cc0f9d6937276b5a1eec949abc280a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure --prefix=/usr/local/stow/emacs --without-imagemagick
 --with-x-toolkit=lucid --with-toolkit-scroll-bars=no
 --with-native-image-api'

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

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

Major mode: Group

Minor modes in effect:
  circe-lagmon-mode: t
  gnus-topic-mode: t
  gnus-undo-mode: t
  mpdel-mode: t
  telega-root-auto-fill-mode: t
  telega-patrons-mode: t
  telega-mode-line-mode: t
  sly-symbol-completion-mode: t
  show-paren-mode: t
  global-diff-hl-mode: t
  eshell-syntax-highlighting-global-mode: t
  shell-dirtrack-mode: t
  winner-mode: t
  global-auto-revert-mode: t
  marginalia-mode: t
  vertico-mode: t
  global-company-mode: t
  company-mode: t
  persistent-scratch-autosave-mode: t
  global-so-long-mode: t
  ednc-mode: t
  display-battery-mode: t
  repeat-mode: t
  savehist-mode: t
  recentf-mode: t
  save-place-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t

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/home/jao/.emacs.d/elpa.28/org-20210510/ol-irc hides 
/usr/local/stow/emacs/share/emacs/28.0.50/lisp/org/ol-irc
/home/jao/.emacs.d/elpa.28/org-20210510/ob-calc hides 
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/home/jao/.emacs.d/elpa.28/org-20210510/ob-comint hides 
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Features:
(shadow mailalias bbdb-message cl-print debug backtrace cus-start
copyright paredit display-fill-column-indicator smartscan quail
gnus-cite qp mm-archive mail-extr gnus-async gnus-bcklg gnus-dup gnus-ml
url-cache emojify tar-mode ht lui-track circe-display-images
circe-color-nicks circe-lagmon circe lui-irc-colors irc lcs lui-format
circe-compat slack slack-company slack-unread slack-websocket
slack-thread-event slack-room-event slack-star-event
slack-reaction-event slack-reply-event slack-typing slack-slash-commands
slack-message-event slack-event slack-dialog-edit-element-buffer
slack-dialog-buffer slack-dialog slack-stars-buffer
slack-search-result-buffer slack-thread-message-compose-buffer
slack-file-list-buffer slack-file-info-buffer slack-all-threads-buffer
slack-message-buffer slack-user-profile-buffer slack-pinned-items-buffer
slack-pinned-item slack-thread-message-buffer slack-room-info-buffer
slack-room-buffer slack-message-share-buffer slack-message-edit-buffer
slack-room-message-compose-buffer slack-message-compose-buffer
slack-message-attachment-preview-buffer slack-action slack-star
slack-reminder slack-search slack-message-reaction slack-message-editor
slack-message-sender slack-message-notification slack-buffer
slack-message-formatter slack-thread slack-im slack-channel slack-group
slack-conversations slack-create-message slack-attachment
slack-selectable slack-bot-message slack-user-message slack-file
slack-message slack-message-faces slack-unescape slack-block
slack-mrkdwn slack-usergroup slack-reaction slack-modeline slack-room
slack-counts slack-user slack-bot slack-dnd-status slack-emoji
slack-image slack-request slack-log request lui flyspell ispell
slack-team slack-team-ws slack-util websocket gnus-topic utf-7 bbdb-gnus
gnus-recent ol-gnus nnselect gnus-search eieio-opt speedbar ezimage
dframe bbdb-mua gnus-icalendar org-capture icalendar gnus-delay
gnus-draft gnus-agent gnus-srvr gnus-score score-mode nnvirtual
gnus-cache gnus-msg gnus-art mm-uu mml2015 gnus-sum nndraft nnmh
gnus-demon nntp gnus-group gnus-undo gnus-start gnus-dbus gnus-cloud
nnimap nnmail mail-source utf7 netrc nnoo gnus-spec gnus-int gnus-range
gnus-win cal-move mule-util cal-iso org-auto-tangle async cdlatex
texmathp bibtex face-remap org-agenda org-refile jao-ednc
exwm-systemtray xcb-systemtray xcb-xembed exwm-edit exwm exwm-input
xcb-keysyms exwm-manage exwm-floating xcb-cursor xcb-render exwm-layout
exwm-workspace exwm-core xcb-ewmh xcb-icccm xcb xcb-xkb xcb-xproto
xcb-types xcb-debug bigml bml-logs bml bml-misc bml-whizzml bml-clojure
bml-clj-tests bml-python bml-skels bml-utils whizzml-skeletons skeleton
whizzml-mode sieve sieve-mode sieve-manage sasl sasl-anonymous
sasl-login sasl-plain jao-emms-random-album mpdel mpdel-browser
libmpdel-directory mpdel-playlist mpdel-tablist mpdel-song mpdel-core
libmpdel time-stamp navigel tablist tablist-filter semantic/wisent/comp
semantic/wisent semantic/wisent/wisent semantic/util-modes semantic/util
semantic semantic/tag semantic/lex semantic/fw mode-local cedet
consult-spotify espotify jao-mpris jao-emms-lyrics jao-lyrics
network-stream jao-emms-info-track jao-emms emms-librefm-stream
emms-librefm-scrobbler emms-playlist-limit emms-volume
emms-volume-mixerctl emms-volume-pulse emms-volume-amixer emms-i18n
emms-history emms-score emms-stream-info emms-metaplaylist-mode
emms-bookmarks emms-cue emms-mode-line-icon emms-browser sort
emms-playlist-sort emms-last-played emms-player-xine emms-player-mpd
emms-playing-time emms-lyrics emms-url emms-streams emms-show-all
emms-tag-editor emms-mark emms-mode-line emms-cache emms-info-exiftool
emms-info-tinytag emms-info-metaflac emms-info-opusinfo
emms-info-ogginfo emms-info-mp3info emms-info emms-later-do
emms-playlist-mode emms-player-vlc emms-player-mpv emms-player-mplayer
emms-player-simple emms-source-playlist emms-source-file locate
emms-setup emms emms-compat telega-obsolete telega telega-tdlib-events
telega-webpage visual-fill-column telega-root telega-info telega-chat
telega-modes telega-company telega-user telega-notifications telega-voip
telega-msg telega-tme telega-sticker telega-i18n telega-vvnote bindat
telega-ffplay telega-media telega-sort telega-filter telega-ins
telega-folders telega-inline telega-tdlib telega-util
rainbow-identifiers telega-server telega-core cursor-sensor
telega-customize emacsbug jao-proton-utils enwc enwc-backend bluetooth
json-mode json-reformat json-snatcher js cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
virtualenvwrapper gud ediprolog haskell-doc inf-haskell
haskell-decl-scan haskell haskell-completions haskell-load
haskell-commands highlight-uses-mode haskell-modules haskell-sandbox
haskell-navigate-imports haskell-repl haskell-svg haskell-collapse
hideshow haskell-debug haskell-interactive-mode
haskell-presentation-mode haskell-compile haskell-hoogle haskell-process
haskell-session haskell-mode haskell-cabal haskell-utils
haskell-font-lock haskell-indentation haskell-string
haskell-sort-imports haskell-lexeme haskell-align-imports
haskell-complete-module haskell-ghc-support flymake-proc flymake
warnings dabbrev haskell-customize sly-quicklisp sly-fancy sly-tramp
sly-indentation sly-cl-indent sly-stickers pulse hi-lock
sly-trace-dialog sly-fontifying-fu sly-package-fu sly-scratch
sly-fancy-trace sly-fancy-inspector sly-mrepl sly-autodoc sly-parse sly
sly-completion sly-buttons sly-messages sly-common apropos arc-mode
archive-mode hyperspec pie geiser-gambit geiser-chez geiser-guile
geiser-mit geiser-repl geiser-image geiser-company geiser-doc
geiser-menu geiser-autodoc info-look geiser-edit etags fileloop xref
project geiser-completion geiser-eval geiser-connection tq geiser-syntax
scheme geiser-impl help-fns radix-tree geiser-log geiser-popup view
geiser-custom geiser-base geiser sesman clojure-mode exunit f idris-mode
idris-commands idris-hole-list idris-ipkg-mode idris-tree-info
idris-warnings-tree idris-info idris-repl idris-highlight-input
idris-prover inferior-idris idris-warnings idris-log idris-events
idris-simple-indent idris-syntax idris-common-utils idris-settings
idris-keys idris-core idris-compat prop-menu package-lint imenu finder
lisp-mnt edit-list paren jao-vterm-repl gitconfig-mode conf-mode
git-link git-timemachine transient gist gh-gist gh-oauth gh-api logito
gh-cache pcache gh-auth gh-common marshal gh-url eieio-compat url-http
url-auth url-gw gh-profile diff-hl log-view pcvs-util vc-dir ewoc vc
eshell-autojump em-dirs esh-var eshell-up git-ps1-mode em-term term
disp-table ehelp eshell-syntax-highlighting em-alias saveplace-pdf-view
notmuch-message notmuch-tag notmuch-lib notmuch-version notmuch-compat
mm-view mml-smime smime dig bbdb-anniv bbdb-com crm bbdb bbdb-site
timezone smtpmail sendmail randomsig message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader ol-eww jao-eww-session eww-lnum eww xdg url-queue mm-url gnus
nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums
mail-utils mm-util mail-prsvr gnutls nsm rmc dns shr kinsoku puny svg
dom elpher markdown-toc markdown-mode htmlize jao-org-links jao-maildir
jao-doc-view let-alist doc-view image-mode exif ol-info ol-bbdb
ol-eshell esh-mode eshell esh-cmd esh-ext esh-opt esh-proc esh-io
esh-arg esh-module esh-groups esh-util jao-org-notes ob-shell ob-scheme
ob-python python tramp-sh tramp tramp-loaddefs trampver
tramp-integration files-x tramp-compat shell parse-time iso8601 ls-lisp
ob-org ob-ocaml ob-makefile ob-haskell ob-gnuplot ob-clojure ob-calc
calc-store calc-trail calc-ext calc calc-loaddefs calc-macs ob-prolog
prolog smie align org-tempo tempo 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 ox-html table ox-ascii ox-publish ox
org-element avl-tree generator org-fragtog jao-afio winner iscroll
autorevert filenotify autoinsert embark-consult embark ffap thingatpt
consult-recoll jao-compilation consult-vertico consult bookmark
marginalia vertico company-keywords company-dabbrev company-files
company-bbdb company-capf company orderless find-dired dired-x dired
dired-loaddefs wgrep grep compile text-property-search jka-compr
persistent-scratch so-long cal-china lunar solar cal-dst cal-bahai
cal-islam cal-hebrew holidays hol-loaddefs vc-git diff-mode
vc-dispatcher appt diary-lib diary-loaddefs ednc jao-minibuffer tracking
shorten jao-notify alert log4e cl notifications gntp diminish time
jao-recoll inform jao-light-theme jao-themes pinentry pcase epa-file epa
battery cus-edit pp cus-load major-mode-hydra pretty-hydra s dash hydra
lv repeat jao-sleep dbus xml server savehist recentf tree-widget
saveplace gnu-elpa-keyring-update epg epg-config poly-org polymode
derived poly-lock polymode-base polymode-weave polymode-export
polymode-compat polymode-methods polymode-core polymode-classes
eieio-custom wid-edit eieio-base color cl-extra help-mode use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key use-package-core literate-elisp org ob
ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-footnote org-src
ob-comint org-pcomplete pcomplete comint ansi-color ring org-list
org-faces org-entities time-date noutline outline easy-mmode org-version
ob-emacs-lisp ob-core ob-eval org-table ol org-keys org-compat advice
org-macs org-loaddefs format-spec find-func cal-menu calendar
cal-loaddefs finder-inf tex-site rx edmacro kmacro w3m-load 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 subr-x map url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib iso-transl tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-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 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 charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice button
loaddefs faces cus-face macroexp files window text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 3101583 348014)
 (symbols 48 98056 275)
 (strings 32 632201 40995)
 (string-bytes 1 20578485)
 (vectors 16 198836)
 (vector-slots 8 6349751 116398)
 (floats 8 2013 1310)
 (intervals 56 230120 14892)
 (buffers 992 71))

-- 
Remember when life's path is steep to keep your mind even.
 -Horace, poet and satirist (65-8 BCE)