bug#2333: 23.0.90; rmail: rmail-summary-by-topic is not reliable

Here is an excerpt of my rmail summary buffer. The point is on
message number 7840.

 7838D  3-Feb      [email protected]  [95] { summit } [Summit] Prepaid cellphones
 7839D  3-Feb          [email protected]  [95] { summit } Re: [Summit] Prepaid cellphones
 7840D  3-Feb          [email protected] [114] { summit } Re: [Summit] Prepaid cellphones
 7844D  3-Feb          [email protected]  [92] { summit } Re: [Summit] Prepaid cellphones

Doing C-M-t RET -i.e. choosing default subject as the topic
returns: No previous message. More generally,
rmail-summary-by-topic is rather unreliable since less than 50%
of the time it will return correct results. I do not see how to
debug that.

I will try with edebug-defun on every part of the
rmail-summary-by-topic function.


In GNU Emacs 23.0.90.2 (i686-pc-linux-gnu, GTK+ Version 2.12.12)
 of 2009-02-14 on zogzog
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--without-xft''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: fr_FR.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: fr_FR.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: RMAIL Summary

Minor modes in effect:
  rcirc-track-minor-mode: t
  eev-mode: t
  jabber-activity-mode: t
  auto-insert-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  show-paren-mode: t
  global-auto-revert-mode: t
  display-time-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  icomplete-mode: t
  desktop-save-mode: t
  auto-image-file-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> C-SPC <down> 
<left> <left> C-w C-e C-x C-e <left> <left> <left> 
<left> <left> <backspace> , C-e C-x C-e C-x C-b C-x 
o h C-x 1 M-x e m a c s - b u <backspace> <backspace> 
r e p o <backspace> <backspace> <backspace> <backspace> 
b u g <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
b u g <tab> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
e m a c s - r e p o <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> r e p o r <tab> <return> r 
m a i l : SPC r m a i l - s C-h f r m a i l - s s u 
m <backspace> <backspace> <backspace> y u <backspace> 
<backspace> u m m a r y - b y - t o p <tab> <backspace> 
<backspace> <backspace> <backspace> <backspace> r e 
g <tab> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> t o p <tab> <return> u m m 
a r y - b y - t o p i c SPC i s SPC n o t SPC r e l 
i a l <backspace> b l e <return> <up> q M-x <up> <
return>

Recent messages:
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Mark set [3 times]
"cron: cd ~/howm && ~/usr/src/bzr-repo/trunk/bzr add"
"cron: cd ~/howm && ~/usr/src/bzr-repo/trunk/bzr\\|add"
Updating buffer list...
Mark set
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Computing summary lines...done
Type "q" to restore this window.

	Xavier
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