bug#43582: 27.1; Avoid topic changes to topicless group

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bug#43582: 27.1; Avoid topic changes to topicless group

dick.r.chiang

Note gnus.general appears *twice* because `gnus-topic-change-level' on a
topicless group will blithely add it to gnus-topic-alist without updating the
group buffer to reflect its new position in the "topology."

emacs-27.1 -Q --batch \
--eval "(custom-set-variables \
 '(network-security-level (quote low)) \
 '(gnus-interactive-exit (quote quiet)) \
 '(gnus-large-newsgroup 4000) \
 '(gnus-select-method (quote (nntp \"news.gmane.io\"))) \
 '(gnus-add-timestamp-to-message (quote log)) \
 '(gnus-before-startup-hook (quote (toggle-debug-on-error))) \
 '(gnus-always-read-dribble-file t) \
 '(gnus-use-dribble-file nil) \
 '(gnus-read-newsrc-file nil) \
 '(gnus-parameters (quote ((\"^nntp\" (display . 1000))))) \
 '(gnus-summary-prepared-hook (quote (gnus-summary-hide-all-threads))) \
 '(gnus-startup-file \"/var/tmp/foo\") \
 )" \
-l gnus-topic \
--eval "(add-hook 'gnus-group-mode-hook 'gnus-topic-mode)" \
-f gnus \
--eval "(gnus-server-open-all-servers)" \
--eval "(gnus-fetch-group \"nntp+news.gmane.io:gmane.emacs.gnus.general\")" \
--eval "(with-current-buffer (gnus-summary-buffer-name \"nntp+news.gmane.io:gmane.emacs.gnus.general\") (gnus-summary-exit))" \
--eval "(goto-char (point-min))" \
--eval "(save-excursion (gnus-group-subscribe nil))" \
--eval "(gnus-topic-move-group nil \"misc\")" \
--eval "(princ (buffer-string) #'external-debugging-output)"


From 88fe5b506efc230cbf172389844502dcc33d98c6 Mon Sep 17 00:00:00 2001
From: dickmao <none>
Date: Wed, 23 Sep 2020 17:15:09 -0400
Subject: [PATCH] Bad things happen when applying topic changes to topicless
 groups

* lisp/gnus/gnus-topic.el (gnus-topic-change-level):
Do not change gnus-topic-alist when group is outside "toplogy."
---
 lisp/gnus/gnus-topic.el | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lisp/gnus/gnus-topic.el b/lisp/gnus/gnus-topic.el
index ffd26bb30f..c913002f70 100644
--- a/lisp/gnus/gnus-topic.el
+++ b/lisp/gnus/gnus-topic.el
@@ -897,9 +897,7 @@ gnus-topic-change-level
     (let ((inhibit-read-only t))
       (unless gnus-topic-inhibit-change-level
  (gnus-group-goto-group (or (car (nth 1 previous)) group))
- (when (and gnus-topic-mode
-   gnus-topic-alist
-   (not gnus-topic-inhibit-change-level))
+ (when (and gnus-topic-mode gnus-topic-alist (gnus-current-topic))
   ;; Remove the group from the topics.
   (if (and (< oldlevel gnus-level-zombie)
    (>= level gnus-level-zombie))
--
2.26.2





In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2020-08-25 built on dick
Repository revision: ddd82c2b1261b2c5d5425c0738112f47e2bb18bf
Repository branch: gnus-dev-27
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.4 LTS

Recent messages:
# todo.org
#

Quit [4 times]
Mark set
Auto-saving...done
Saving file /home/dick/emacs/.git/COMMIT_EDITMSG...
Wrote /home/dick/emacs/.git/COMMIT_EDITMSG
Git finished
Mark saved where search started [2 times]

Configured using:
 'configure --prefix=/home/dick/.local --with-rsvg=yes --with-xml2=yes'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY LIBSELINUX
GNUTLS LIBXML2 FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE
XIM MODULES THREADS JSON PDUMPER GMP

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

Major mode: Outline

Minor modes in effect:
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode semantic-show-unmatched-syntax-mode)  S)))
  pdf-occur-global-minor-mode: t
  bug-reference-mode: t
  pyvenv-mode: t
  show-paren-mode: t
  global-magit-file-mode: t
  magit-file-mode: t
  magit-auto-revert-mode: t
  auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  flx-ido-mode: t
  projectile-mode: t
  ido-everywhere: t
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  shell-dirtrack-mode: t
  global-hl-line-mode: t
  winner-mode: t
  cl-old-struct-compat-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/dick/ESS/lisp/obsolete/ess-swv hides /home/dick/ESS/lisp/ess-swv
/home/dick/ESS/lisp/obsolete/ess-rutils hides /home/dick/ESS/lisp/ess-rutils
/home/dick/ESS/lisp/obsolete/ess-noweb hides /home/dick/ESS/lisp/ess-noweb
/home/dick/ESS/lisp/obsolete/mouseme hides /home/dick/ESS/lisp/mouseme
/home/dick/ESS/lisp/obsolete/ess-mouse hides /home/dick/ESS/lisp/ess-mouse
/home/dick/ESS/lisp/obsolete/ess-noweb-mode hides /home/dick/ESS/lisp/ess-noweb-mode
/home/dick/ESS/lisp/obsolete/make-regexp hides /home/dick/ESS/lisp/make-regexp
/home/dick/ESS/lisp/obsolete/ess-r-a hides /home/dick/ESS/lisp/ess-r-a
/home/dick/ESS/lisp/obsolete/ess-noweb-font-lock-mode hides /home/dick/ESS/lisp/ess-noweb-font-lock-mode
/home/dick/gomacro-mode/gomacro-mode hides /home/dick/.emacs.d/elpa/gomacro-mode-20200326.1103/gomacro-mode
/home/dick/ESS/lisp/julia-mode-latexsubs hides /home/dick/.emacs.d/elpa/julia-mode-20200717.1915/julia-mode-latexsubs
/home/dick/ESS/lisp/julia-mode hides /home/dick/.emacs.d/elpa/julia-mode-20200717.1915/julia-mode
/home/dick/.emacs.d/elpa/hydra-20170924.2259/lv hides /home/dick/.emacs.d/elpa/lv-20191106.1238/lv
/home/dick/melpa-stats/melpa-stats hides /home/dick/.emacs.d/elpa/melpa-stats-20190720.1833/melpa-stats
/home/dick/.emacs.d/elpa/async-20200113.1745/async-autoloads hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-autoloads
/home/dick/.emacs.d/elpa/async-20200113.1745/async-bytecomp hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-bytecomp
/home/dick/.emacs.d/elpa/async-20200113.1745/smtpmail-async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/smtpmail-async
/home/dick/.emacs.d/elpa/async-20200113.1745/dired-async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/dired-async
/home/dick/.emacs.d/elpa/async-20200113.1745/async hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async
/home/dick/.emacs.d/elpa/async-20200113.1745/async-pkg hides /home/dick/.local/share/emacs/site-lisp/emacs-async/async-pkg
/home/dick/.emacs.d/lisp/json hides /home/dick/.local/share/emacs/27.1/lisp/json
/home/dick/.emacs.d/elpa/map-2.1/map hides /home/dick/.local/share/emacs/27.1/lisp/emacs-lisp/map

Features:
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Memory information:
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bug#43582: 27.1; Avoid topic changes to topicless group

Lars Ingebrigtsen
dick <[hidden email]> writes:

> Note gnus.general appears *twice* because `gnus-topic-change-level' on a
> topicless group will blithely add it to gnus-topic-alist without updating the
> group buffer to reflect its new position in the "topology."

Thanks; applied to Emacs 28.

--
(domestic pets only, the antidote for overdose, milk.)
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