bug#28477: 25.2; Gnus threading sometimes erratic

[N. Jackson]

Sometimes when threading is enabled, Gnus displays the messages in
a thread in a bizarre order in the *Summary* buffer, with an older
message shown as a reply to a newer message. This cannot be right
unless the author of one of the messages has a time machine.

Attached are two screen shots showing this problem, one with a
thread from the Emacs development list and one with a thread from
this list.

I would estimate that the frequency of the problem is about once
in around 1000 messages.

The problem isn't new, but I do not think it has always happened.
It's been happening for maybe a year or two I think.

I have the following settings for threading:

  (setq gnus-article-sort-functions '((not gnus-article-sort-by-number)))
  (setq gnus-thread-sort-functions '((not 
gnus-thread-sort-by-most-recent-number)))
  (setq gnus-subthread-sort-functions '((not 
gnus-thread-sort-by-most-recent-number)))

. Changing these to:

  (setq gnus-article-sort-functions '((not gnus-article-sort-by-date)))
  (setq gnus-thread-sort-functions '((not 
gnus-thread-sort-by-most-recent-date)))
  (setq gnus-subthread-sort-functions '((not 
gnus-thread-sort-by-most-recent-date)))

does not solve the problem.

I thought perhaps that the `gnus-sort-gathered-threads-function'
might be the solution here, but so far I have had no success with
it. If I try to do

  (setq gnus-sort-gathered-threads-function '((not gnus-thread-sort-by-date)))

, when the *Summary* buffer opens I get the error message

  sort: Invalid function: ((not gnus-thread-sort-by-date))

.

It almost seems that "a list containing functions and ‘(not
some-function)’ elements" is not supported here?

To try to work around this, I tried

  (defun nlj-thread-sort-by-date-descending (h1 h2)
    "Sort threads in the opposite order to `gnus-thread-sort-by-date'."
    (not (gnus-thread-sort-by-date h1 h2)))

  (setq gnus-sort-gathered-threads-function 'nlj-thread-sort-by-date-descending)

which avoids the error message but produces an outlandish sorting
order.

exhibit-one.png
Description: Screenshot 1

exhibit-two.png
Description: Screenshot 2

In GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.11)
 of 2017-04-26 built on moondust.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11903000
System Description:     Fedora release 25 (Twenty Five)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

Important settings:
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  TeX-PDF-mode: t
  csv-field-index-mode: t
  flyspell-mode: t
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Recent messages:
20170917T005607.066> Generating summary...done
Mark set [2 times]
Auto-saving...done
Mark set [2 times]
Auto-saving...done
Mark set
next-line: End of buffer [2 times]
Auto-saving...done
Mark set [3 times]
Auto-saving...

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gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls gnutls
utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range message rfc822
mml mml-sec password-cache epg mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 ietf-drums gmm-utils mailheader gnus-win gnus
gnus-ems nnheader mail-utils mm-util help-fns mail-prsvr org-eldoc
org-w3m org-rmail org-mhe org-irc org-info org-habit org-gnus gnus-util
org-docview doc-view subr-x jka-compr image-mode dired-x dired
org-bibtex bibtex org-bbdb org-agenda org-element avl-tree org advice
org-macro org-footnote org-pcomplete org-list org-faces org-entities
noutline outline easy-mmode cl-seq org-version ob-shell shell pcomplete
ob-R ob-python ob-plantuml ob-org ob-gnuplot ob-ditaa ob-calc calc-store
calc-trail calc-ext calc calc-loaddefs calc-macs ob-awk ob-dot ob-maxima
ob-latex ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table
ob-keys ob-exp ob-comint comint ansi-color ring ob-core ob-eval
org-compat org-macs org-loaddefs format-spec find-func bbdb-anniv
diary-lib diary-loaddefs cal-menu calendar cal-loaddefs bbdb-com crm
mailabbrev bbdb bbdb-site timezone bbdb-loaddefs finder-inf tex-site
info package epg-config ido seq byte-opt gv bytecomp byte-compile
cl-extra help-mode cconv edmacro kmacro recentf tree-widget wid-edit
easymenu battery time wheatgrass-theme paren savehist saveplace
elec-pair desktop frameset cl-loaddefs pcase cl-lib delsel cua-base
cus-start cus-load time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame 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 charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1089431 137958)
 (symbols 48 91117 0)
 (miscs 40 21852 6282)
 (strings 32 242283 13994)
 (string-bytes 1 9961925)
 (vectors 16 68138)
 (vector-slots 8 1897265 137679)
 (floats 8 638 1190)
 (intervals 56 101369 7)
 (buffers 976 247))