bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[Jose A. Ortega Ruiz via Bug reports for GNU Emacs, the Swiss army knife of text editors]

gnus-summary-refer-thread doesn't seem to work:

- Enter a group with threads in it, with all its messages already
  read. Tick the first message of one of them.
- Reenter the group, so that only one message is shown, the ticked one
- Invoke gnus-summary-refer-thread (A T): gnus says that no other
  messages are present in the thread

I can reproduce this with all backends I use, and at first thought it
was because of the spurious ids protonmail introduces. But it also
happens in pure NNTP groups, for instance reading emacs bug groups from
gmane.

It's also worth noting that Gnus has no trouble finding the parent of
the message it says belongs to no thread, via ^


In GNU Emacs 30.0.50 (build 8, x86_64-pc-linux-gnu, cairo version
 1.18.0) of 2024-06-07 built on osgiliath
Repository revision: 6906ed28f1b4ac0cf0a2a725e7402290f33c26e2
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --prefix /usr/local/stow/emacs30jit --with-x-toolkit=no
 --with-native-compilation --with-imagemagick'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBSELINUX LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY OLDXMENU PDUMPER PNG RSVG SECCOMP SOUND
SQLITE3 THREADS TIFF TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM ZLIB

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

Major mode: Summary

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  eat-eshell-visual-command-mode: t
  eat-eshell-mode: t
  circe-lagmon-mode: t
  exwm-systemtray-mode: t
  telega-root-auto-fill-mode: t
  telega-contact-birthdays-mode: t
  telega-active-video-chats-mode: t
  telega-active-locations-mode: t
  telega-patrons-mode: t
  telega-mode-line-mode: t
  telega-active-stories-mode: t
  global-diff-hl-mode: t
  eshell-syntax-highlighting-global-mode: t
  winner-mode: t
  global-auto-revert-mode: t
  vertico-multiform-mode: t
  vertico-mode: t
  marginalia-mode: t
  persistent-scratch-autosave-mode: t
  ednc-mode: t
  jao-minibuffer-mode: t
  minibuffer-electric-default-mode: t
  minibuffer-depth-indicate-mode: t
  repeat-mode: t
  server-mode: t
  savehist-mode: t
  recentf-mode: t
  save-place-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/jao/lib/elisp/notmuch/notmuch-compat hides /usr/local/share/emacs/site-lisp/notmuch-compat
/home/jao/lib/elisp/notmuch/notmuch hides /usr/local/share/emacs/site-lisp/notmuch
/home/jao/lib/elisp/notmuch/notmuch-tree hides /usr/local/share/emacs/site-lisp/notmuch-tree
/home/jao/lib/elisp/notmuch/notmuch-lib hides /usr/local/share/emacs/site-lisp/notmuch-lib
/home/jao/lib/elisp/notmuch/notmuch-message hides /usr/local/share/emacs/site-lisp/notmuch-message
/home/jao/lib/elisp/notmuch/notmuch-address hides /usr/local/share/emacs/site-lisp/notmuch-address
/home/jao/lib/elisp/notmuch/notmuch-show hides /usr/local/share/emacs/site-lisp/notmuch-show
/home/jao/lib/elisp/notmuch/notmuch-wash hides /usr/local/share/emacs/site-lisp/notmuch-wash
/home/jao/lib/elisp/notmuch/notmuch-print hides /usr/local/share/emacs/site-lisp/notmuch-print
/home/jao/lib/elisp/notmuch/notmuch-company hides /usr/local/share/emacs/site-lisp/notmuch-company
/home/jao/lib/elisp/notmuch/notmuch-hello hides /usr/local/share/emacs/site-lisp/notmuch-hello
/home/jao/lib/elisp/notmuch/notmuch-parser hides /usr/local/share/emacs/site-lisp/notmuch-parser
/home/jao/lib/elisp/notmuch/coolj hides /usr/local/share/emacs/site-lisp/coolj
/home/jao/lib/elisp/notmuch/notmuch-jump hides /usr/local/share/emacs/site-lisp/notmuch-jump
/home/jao/lib/elisp/notmuch/notmuch-maildir-fcc hides /usr/local/share/emacs/site-lisp/notmuch-maildir-fcc
/home/jao/lib/elisp/notmuch/notmuch-tag hides /usr/local/share/emacs/site-lisp/notmuch-tag
/home/jao/lib/elisp/notmuch/notmuch-version hides /usr/local/share/emacs/site-lisp/notmuch-version
/home/jao/lib/elisp/notmuch/notmuch-mua hides /usr/local/share/emacs/site-lisp/notmuch-mua
/home/jao/lib/elisp/notmuch/notmuch-crypto hides /usr/local/share/emacs/site-lisp/notmuch-crypto
/home/jao/lib/elisp/notmuch/notmuch-draft hides /usr/local/share/emacs/site-lisp/notmuch-draft
/home/jao/lib/elisp/notmuch/notmuch-query hides /usr/local/share/emacs/site-lisp/notmuch-query
/home/jao/.emacs.d/elpa.30/transient-20240603.2200/transient hides /usr/local/stow/emacs30jit/share/emacs/30.0.50/lisp/transient
/home/jao/etc/emacs/site/custom hides /usr/local/stow/emacs30jit/share/emacs/30.0.50/lisp/custom

Features:
(shadow shortdoc display-line-numbers jenkins cl-print backtrace
magit-extras emacsql-sqlite-builtin embark-vc forge-repos forge-topics
forge-tablist forge-commands forge-semi forge-bitbucket buck forge-gogs
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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 magit-diff
git-commit log-edit add-log magit-core magit-autorevert magit-margin
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magit-base magit-section cider-macroexpansion cider tramp-sh cider-debug
cider-browse-ns cider-mode cider-xref-backend cider-find cider-inspector
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archive-mode cider-repl-history pulse cider-repl cider-resolve
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cider-clojuredocs cider-eldoc cider-docstring cider-client cider-common
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nrepl-client cider-util sesman queue nrepl-dict spinner parseedn
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flow-fill sort gnus-cite qp mm-archive mail-extr gnus-async gnus-bcklg
gnus-dup gnus-ml gnus-topic utf-7 imap rfc2104 nnml executable copyright
bbdb-gnus bbdb-mua gnus-icalendar ol-gnus nnselect gnus-demon gnus-delay
gnus-draft gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp
gnus-cache gnus-msg gnus-art mm-uu mml2015 nndraft nnmh gnus-sum
gnus-group gnus-undo gnus-start gnus-dbus gnus-cloud nnimap nnmail
mail-source utf7 nnoo gnus-spec gnus-int gnus-range gnus-win cal-move
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circe-lagmon lui-track circe-display-images circe lui-irc-colors irc lcs
lui-logging lui-format lui flyspell ispell circe-compat mastodon-media
textsec uni-scripts idna-mapping ucs-normalize uni-confusable
textsec-check mastodon-profile mastodon-tl paredit whitespace
display-fill-column-indicator symbol-overlay vertico-directory
tramp-cmds face-remap network-stream url-http url-gw nsm url-cache
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mastodon mastodon-search mastodon-toot facemenu mastodon-iso
mastodon-http telega-obsolete telega telega-tdlib-events telega-webpage
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telega-modes telega-company telega-emoji telega-user
telega-notifications telega-voip telega-msg telega-story telega-tme
telega-sticker telega-vvnote bindat telega-ffplay telega-i18n
telega-sort telega-filter telega-ins telega-inline telega-util
telega-folders telega-topic telega-media telega-tdlib
rainbow-identifiers dired-aux telega-server telega-core cursor-sensor
color telega-customize emacsbug jao-mullvad bluetooth json-mode smie
virtualenvwrapper gud s pie 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-process
haskell-session haskell-hoogle consult-hoogle hoogle-base align
geiser-chez geiser-guile tramp trampver tramp-integration tramp-message
tramp-compat parse-time iso8601 tramp-loaddefs info-look geiser-debug
geiser-repl geiser-image geiser-capf geiser-doc geiser-menu
geiser-autodoc geiser-edit 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
package-lint let-alist finder lisp-mnt edit-list outline-minor-faces
git-modes gitignore-mode gitconfig-mode conf-mode gitattributes-mode
git-link git-timemachine diff-hl log-view pcvs-util vc-dir ewoc vc
jao-eshell-here eshell-autojump em-dirs eshell-up git-ps1-mode em-term
term disp-table ehelp eshell-syntax-highlighting em-prompt em-alias
jao-custom-email jao-custom-notmuch consult-notmuch org-capture
jao-notmuch link-hint avy 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 goto-addr icalendar
notmuch-tag notmuch-lib notmuch-version notmuch-compat hl-line mm-view
mml-smime smime gnutls dig bbdb-anniv bbdb-com crm bbdb bbdb-site
timezone randomsig message sendmail yank-media rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils jao-proton-utils nov imenu esxml-query
saveplace-pdf-view jao-custom-eww ol-eww jao-eww-session eww url-queue
shr pixel-fill kinsoku url-file svg puny mm-url gnus nnheader gnus-util
range edit-indirect reverso dom request mailheader mail-utils
jao-custom-blog htmlize jao-custom-org jao-org-links jao-doc-view
jao-pdf doc-view image-mode exif ol-info ol-eshell esh-mode esh-var
eshell esh-cmd esh-ext esh-opt esh-proc esh-io esh-arg esh-module
esh-module-loaddefs esh-util files-x jao-org-notes ob-shell shell
ob-scheme ob-python python treesit ob-org ob-ocaml ob-makefile
ob-haskell ob-gnuplot ob-clojure ob-calc calc-store calc-trail calc-ext
calc calc-loaddefs rect calc-macs org-tempo tempo ox-pandoc ht dash
ox-org ox-texinfo ox-latex ox-html table ox-ascii ox-publish ox
org-fragtog embark-org org-element org-persist xdg org-id org-refile
avl-tree org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-src ob-comint org-pcomplete pcomplete org-list org-footnote
org-faces org-entities time-date ob-emacs-lisp ob-core ob-eval org-cycle
org-table ol org-fold org-fold-core org-keys oc org-loaddefs find-func
org-version org-compat org-macs advice winner autorevert filenotify
consult-recoll embark-consult consult bookmark jao-custom-completion
embark ffap vertico-multiform vertico marginalia orderless
jao-skel-latex jao-skel-haskell 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
thingatpt etags fileloop generator xref project dabbrev
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skeleton autoinsert wgrep grep compile text-property-search comint
ansi-osc ring jka-compr dired-duplicates dired-x dired dired-loaddefs
persistent-scratch cal-china lunar solar cal-dst cal-bahai cal-islam
cal-hebrew holidays holiday-loaddefs vc-git diff-mode track-changes
vc-dispatcher appt diary-lib diary-loaddefs cal-menu calendar
cal-loaddefs jao-ednc ednc mm-util mail-prsvr jao-tracking jao-afio
jao-doc-session tracking shorten jao-notify alert log4e notifications
gntp battery noutline outline diminish jao-mode-line comp comp-cstr
warnings comp-run comp-common rx jao-minibuffer minibuf-eldef mb-depth
man jao-light-theme jao-themes ansi-color epa-file epa derived epg
rfc6068 epg-config transient format-spec compat repeat jao-shell edmacro
kmacro jao-sleep dbus xml server savehist recentf tree-widget saveplace
persist cus-edit pp cus-load wid-edit jao-gnus-private
gnu-elpa-keyring-update cl-extra help-mode use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key easy-mmode use-package-core finder-inf
alert-autoloads auctex-autoloads tex-site bash-completion-autoloads
bbdb-autoloads bluetooth-autoloads casual-dired-autoloads
cider-autoloads circe-autoloads clojure-mode-autoloads
consult-git-log-grep-autoloads consult-hoogle-autoloads
diff-hl-autoloads diminish-autoloads dired-duplicates-autoloads
eat-autoloads edit-indirect-autoloads edit-list-autoloads ednc-autoloads
embark-consult-autoloads consult-autoloads embark-vc-autoloads
embark-autoloads eshell-autojump-autoloads
eshell-syntax-highlighting-autoloads eshell-up-autoloads exwm-autoloads
exwm-edit-autoloads flymake-hlint-autoloads flymake-easy-autoloads
forge-autoloads closql-autoloads emacsql-autoloads ghub-autoloads
git-link-autoloads git-modes-autoloads git-ps1-mode-autoloads
git-timemachine-autoloads gntp-autoloads
gnu-elpa-keyring-update-autoloads goto-chg-autoloads
haskell-mode-autoloads hlint-refactor-autoloads htmlize-autoloads
jenkins-autoloads json-mode-autoloads link-hint-autoloads avy-autoloads
log4e-autoloads magit-autoloads pcase git-commit-autoloads
magit-section-autoloads marginalia-autoloads markdown-toc-autoloads
markdown-mode-autoloads mastodon-autoloads nov-autoloads esxml-autoloads
kv-autoloads orderless-autoloads org-cliplink-autoloads
org-fragtog-autoloads org-static-blog-autoloads
outline-minor-faces-autoloads ox-pandoc-autoloads ht-autoloads
package-lint-autoloads paredit-autoloads parseedn-autoloads
parseclj-autoloads password-store-autoloads persist-autoloads
persistent-scratch-autoloads queue-autoloads reverso-autoloads
request-autoloads saveplace-pdf-view-autoloads sesman-autoloads
spinner-autoloads symbol-overlay-autoloads telega-autoloads
rainbow-identifiers-autoloads transient-autoloads treepy-autoloads
vertico-autoloads virtualenvwrapper-autoloads s-autoloads dash-autoloads
visual-fill-column-autoloads wgrep-autoloads info with-editor-autoloads
xclip-autoloads xelb-autoloads yaml-autoloads yaml-mode-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 rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd touch-screen 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 dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo xinput2 x
multi-tty move-toolbar make-network-process native-compile emacs)

Memory information:
((conses 16 4335534 759989) (symbols 48 122405 433) (strings 32 866101 46043)
 (string-bytes 1 27253991) (vectors 16 276411) (vector-slots 8 5151686 326992)
 (floats 8 301984 40001) (intervals 56 82586 27140) (buffers 992 262))

-- 
千里之行始於足下
The journey of a thousand miles begins with a single step.
  — 老子 (Lao Tsu) in Chapter 64 of 道德经 (Tao Te Ching)

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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

> gnus-summary-refer-thread doesn't seem to work:
>
> - Enter a group with threads in it, with all its messages already
>   read. Tick the first message of one of them.
> - Reenter the group, so that only one message is shown, the ticked one
> - Invoke gnus-summary-refer-thread (A T): gnus says that no other
>   messages are present in the thread

Hi,

I'm using `gnus-summary-refer-thread' all the time and this is still
working for me.  But I'm using mostly nnml backends.
-- 
Manuel Giraud

bug#71439: Acknowledgement (30.0.50; gnus-summary-refer-thread doesn't work)

[jao via Bug reports for GNU Emacs, the Swiss army knife of text editors]

It's actually not completely true that ^
(gnus-summary-refer-parent-article) works. There are circumstances in
which it also seem to fail. I think it's when a tree has multiple
subtrees and one reaches the top of one of them: then it fails.

    |
    |-
    | |-
    | |- 
    |-
      |-     <-- failure here
        -    <-- works here and belos

I think it fails also sometimes when reaching the top of the main tree,
which would be consistent to the failure reaching the top of subtrees,
and might be related to the failure collecting entire threads, but I am
just guessing.

These are the possibly relevant variables I set in my config:

(setq gnus-show-threads t
      gnus-thread-hide-subtree t
      gnus-build-sparse-threads nil
      gnus-refer-thread-use-search t
      gnus-summary-make-false-root 'adopt
      gnus-summary-gather-subject-limit nil
      gnus-summary-thread-gathering-function #'gnus-gather-threads-by-subject
      gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date
      gnus-thread-sort-functions '(gnus-thread-sort-by-date))

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[jao via Bug reports for GNU Emacs, the Swiss army knife of text editors]

On Sat, Jun 08 2024, Manuel Giraud wrote:

> "Jose A. Ortega Ruiz" via "Bug reports for GNU Emacs, the Swiss army
> knife of text editors" <bug-gnu-emacs@gnu.org> writes:
>
>> gnus-summary-refer-thread doesn't seem to work:
>>
>> - Enter a group with threads in it, with all its messages already
>>   read. Tick the first message of one of them.
>> - Reenter the group, so that only one message is shown, the ticked one
>> - Invoke gnus-summary-refer-thread (A T): gnus says that no other
>>   messages are present in the thread
>
> Hi,
>
> I'm using `gnus-summary-refer-thread' all the time and this is still
> working for me.  But I'm using mostly nnml backends.

Hi Manuel,

Thanks for the feedback. I guess then it depends on some configuration
parameter or another. Did you see the customizations I posted? Does it
differ in any way from yours?

(setq gnus-face-1 'jao-gnus-face-tree
      gnus-show-threads t
      gnus-thread-hide-subtree t
      gnus-build-sparse-threads nil
      gnus-refer-thread-use-search t
      gnus-summary-make-false-root 'adopt
      gnus-summary-gather-subject-limit nil ;; 120
      gnus-summary-thread-gathering-function #'gnus-gather-threads-by-subject
      gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date
      gnus-thread-sort-functions '(gnus-thread-sort-by-date))

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[Manuel Giraud via Bug reports for GNU Emacs, the Swiss army knife of text editors]

jao <mail@jao.io> writes:


[...]

> Hi Manuel,
>
> Thanks for the feedback. I guess then it depends on some configuration
> parameter or another. Did you see the customizations I posted? Does it
> differ in any way from yours?

Hi Jose,

Here are my current values for those settings (those prefix by * were
modified from the original value):

gnus-face-1 is 'italic
gnus-show-threads is t
gnus-thread-hide-subtree is nil
gnus-build-sparse-threads is nil
gnus-refer-thread-use-search is nil
gnus-summary-make-false-root is 'adopt
gnus-summary-gather-subject-limit is nil
*gnus-summary-thread-gathering-function is 'gnus-gather-threads-by-references
gnus-sort-gathered-threads-function is 'gnus-thread-sort-by-number
*gnus-thread-sort-functions is '(gnus-thread-sort-by-date)

> (setq gnus-face-1 'jao-gnus-face-tree
>       gnus-show-threads t
>       gnus-thread-hide-subtree t
>       gnus-build-sparse-threads nil
>       gnus-refer-thread-use-search t
>       gnus-summary-make-false-root 'adopt
>       gnus-summary-gather-subject-limit nil ;; 120
>       gnus-summary-thread-gathering-function #'gnus-gather-threads-by-subject
>       gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date
>       gnus-thread-sort-functions '(gnus-thread-sort-by-date))
-- 
Manuel Giraud

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[jao via Bug reports for GNU Emacs, the Swiss army knife of text editors]

On Sat, Jun 08 2024, Manuel Giraud wrote:

> Hi Jose,
>
> Here are my current values for those settings (those prefix by * were
> modified from the original value):
>
> gnus-face-1 is 'italic
> gnus-show-threads is t
> gnus-thread-hide-subtree is nil
> gnus-build-sparse-threads is nil
> gnus-refer-thread-use-search is nil
> gnus-summary-make-false-root is 'adopt
> gnus-summary-gather-subject-limit is nil
> *gnus-summary-thread-gathering-function is 'gnus-gather-threads-by-references
> gnus-sort-gathered-threads-function is 'gnus-thread-sort-by-number
> *gnus-thread-sort-functions is '(gnus-thread-sort-by-date)
>
>> (setq gnus-face-1 'jao-gnus-face-tree
>>       gnus-show-threads t
>>       gnus-thread-hide-subtree t
>>       gnus-build-sparse-threads nil
>>       gnus-refer-thread-use-search t
>>       gnus-summary-make-false-root 'adopt
>>       gnus-summary-gather-subject-limit nil ;; 120
>>       gnus-summary-thread-gathering-function #'gnus-gather-threads-by-subject
>>       gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date
>>       gnus-thread-sort-functions '(gnus-thread-sort-by-date))

Interestingly, setting gnus-refer-thread-use-search makes A T throw an
error for me in an nnml summary buffer, with the backtrace:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  nnheader-find-nov-line(nil)
  nnheader-nov-delete-outside-range(nil nil)
  nnml-retrieve-headers-with-nov(nil nil)
  nnml-retrieve-headers(nil "jao.hacking" "" nil)
  gnus-retrieve-headers(nil "nnml:jao.hacking" nil)
  gnus-fetch-headers(nil nil t)
  gnus-search-thread([44915 "Re: bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work" "\"Manuel Giraud\" <manuel@ledu-giraud.fr>" #("Sat, 08 Jun 2024 23:30:04 +0200" 0 1 (gnus-time (26212 52572))) "<878qzfw2ar.fsf@ledu-giraud.fr>" "<87tti3s9it.fsf@mail.jao.io> <87cyorwgbx.fsf@ledu-giraud.fr> <87cyors6ck.fsf@mail.jao.io>" 1291 43 "osgiliath jao.hacking:44915" ((To . "\"jao\" <mail@jao.io>") (Cc . "\"Jose A. Ortega Ruiz\\\" via \\\"Bug reports for GNU Emacs@osgiliath.local, the Swiss army knife of text editors\" <bug-gnu-emacs@gnu.org>, <71439@debbugs.gnu.org>"))])
  gnus-summary-refer-thread(nil)
  funcall-interactively(gnus-summary-refer-thread nil)
  call-interactively(gnus-summary-refer-thread nil nil)
  command-execute(gnus-summary-refer-thread)

while setting all the other parameters to your values but that one
doesn't fix the original problem: i am told, incorrectly:

"No other articles in thread"

bug#71439: 30.0.50; gnus-summary-refer-thread doesn't work

[Jose A. Ortega Ruiz]

On Sat, Jun 08 2024, jao via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> Interestingly, setting gnus-refer-thread-use-search makes A T throw an

                                                     ^ to nil

> error for me in an nnml summary buffer, with the backtrace:

bug#71439: Acknowledgement (30.0.50; gnus-summary-refer-thread doesn't work)

[jao via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi,

I've finally tracked down this problem to my use of a bespoke search
engine based on the 'recoll' indexer. gnus-summary-refer-thread
uses the search functionality of the configured engine, and mine wasn't
handling correctly serches for a "thread".

So, this is not a bug and can be closed. Sorry for the noise.

Cheers,
jao
-- 
"People sometimes ask me if it is a sin in the Church of Emacs to use vi.
 Using a free version of vi is not a sin; it's a penance".
  -Richard Stallman

bug#71439: Acknowledgement (30.0.50; gnus-summary-refer-thread doesn't work)

[Eli Zaretskii]

> Date: Mon, 16 Sep 2024 19:43:05 +0000
> From:  jao via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> Hi,
> 
> I've finally tracked down this problem to my use of a bespoke search
> engine based on the 'recoll' indexer. gnus-summary-refer-thread
> uses the search functionality of the configured engine, and mine wasn't
> handling correctly serches for a "thread".
> 
> So, this is not a bug and can be closed. Sorry for the noise.

Thanks, closing.