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bug#14191: 24.3.50; (buffer-list) returns list with non-current buffer a

From: Joost Kremers
Subject: bug#14191: 24.3.50; (buffer-list) returns list with non-current buffer as its first element
Date: Fri, 12 Apr 2013 14:34:05 +0200
User-agent: mu4e; emacs

(buffer-list) returns a list of buffers, but the first buffer in the
list is not the current buffer.

Recipe to reproduce:

- start Emacs with `emacs -Q'

- M-x ielm RET

- at the prompt, type (buffer-list)

Output (list of buffers wrapped for better readability):

| *** Welcome to IELM ***  Type (describe-mode) for help.
| ELISP> (buffer-list)
| (#<buffer *scratch*> #<buffer  *Minibuf-1*> #<buffer  *Minibuf-0*>
|  #<buffer *Messages*> #<buffer  *code-conversion-work*> 
|  #<buffer  *Echo Area 0*> #<buffer  *Echo Area 1*> #<buffer *ielm*>)

Although the *ielm* buffer is current, the first buffer in the list is
the *scratch* buffer.

Doing the same thing in an Emacs Debian (Ubuntu) snapshot from a few
weeks ago:

| *** Welcome to IELM ***  Type (describe-mode) for help.
| ELISP> (buffer-list)
| (#<buffer *ielm*> #<buffer *scratch*> #<buffer  *Minibuf-1*>
|  #<buffer  *Minibuf-0*> #<buffer *Messages*>
|  #<buffer  *code-conversion-work*> #<buffer  *Echo Area 0*>
|  #<buffer  *Echo Area 1*>)
| ELISP> (emacs-version)
| "GNU Emacs (i686-pc-linux-gnu)\n of 2013-03-19 on gold, modified by 

Here, the output of buffer-list has the *ielm* buffer as its first
element. (Note, I've included the output of (emacs-version) here: this
is obviously *not* the version in which the bug occurs. That version is
given below.)

Note that I'm just using the *ielm* buffer to show the output of
(buffer-list). It has nothing to do with the bug itself. Using `M-x eval
RET (buffer-list) RET' gives the same result, as does using
(buffer-list) in Elisp. (Which is how I ran into the bug: swbuff.el from
http://emhacks.sourceforge.net/ stopped working properly. I traced the
problem to this changed behaviour of buffer-list.)


Joost Kremers

In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 3.6.0)
 of 2013-04-11 on fermium, modified by Debian
 (emacs-snapshot package, version 2:20130410-1~ppa1~quantal1)
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
System Description:     Ubuntu 12.10

Configured using:
 `configure --build i686-linux-gnu --host i686-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 --without-compress-info --with-crt-dir=/usr/lib/i386-linux-gnu/
 --with-x=yes --with-x-toolkit=gtk3 --with-imagemagick=yes

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: IELM

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-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
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x i e l m <return> ( b u f f e r - l i s t ) <return> 
<help-echo> <help-echo> <help-echo> <up> <up> <up> 
<up> C-a a <backspace> <up> <left> <left> <left> <left> 
<left> <left> <left> C-SPC <down> <down> <down> <down> 
<down> <down> M-w ( e m a c s - v e r s i o n ) <return> 
<help-echo> <help-echo> <up> <up> <up> <right> C-SPC 
<down> <down> M-w C-x C-g M-x e m a c <tab> b u <tab> 
<M-backspace> <M-backspace> r e p <tab> o r <tab> 

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
End of buffer
Mark set
Making completion list...

Load-path shadows:
None found.

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Joost Kremers
Life has its moments

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