23.0.60; Defaut encoding for XML files should be undefined (instead of utf-8)

[Sébastien Vauban]

Hi,

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

When I'm opening an XML file that I've saved in iso-latin-1
encoding, it's not correctly opened if there is no header,
cookie or local variable telling about my encoding.

This is how it looks like, when opened, as it is read by default
as utf-8 (while being iso-latin-1):

--8<---------------cut here---------------start------------->8---
    <enumType name="test">
      <pair value="11">D\373 \340 l'entreprise</pair>
      <pair value="12">Stagiaire occup\351</pair>
      <pair value="36">Autres</pair>
    </enumType>
--8<---------------cut here---------------end--------------->8---

    PS- I've manually edited the accented characters, rewriting û
        (and the others) with \373 so that you can see what I
        see.

The bug is: the default for XML files shouldn't be `utf-8' but
`undefined' (i.e. the usual default which tries to auto-detect
the encoding).


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.12.0)
 of 2007-12-30 on iridium
 (emacs-snapshot package, version 1:20071229-1~gutsy)
Windowing system distributor `The X.Org Foundation', version 11.0.10300000
configured using `configure  '--build' 'i486-linux-gnu' '--host' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.0.60/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' '--enable-font-backend' '--with-xft' 
'--with-freetype' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 
'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2''

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

Major mode: Article

Minor modes in effect:
  show-paren-mode: t
  recentf-mode: t
  auto-image-file-mode: t
  shell-dirtrack-mode: t
  global-hi-lock-mode: t
  icomplete-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<right> SPC R E G <backspace> T <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <right> 
` <right> <right> <right> <right> <right> <right> <right> 
<right> <right> ' <down> <down> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <right> i s o - <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <C-home> 
C-c C-c . h e <tab> <return> <f6> <down> <down> <return> 
<f6> <f6> <f3> m t o f i <backspace> <backspace> <backspace> 
<backspace> o t i f . * x m l <backspace> <backspace> 
<backspace> <backspace> <backspace> d e l a i t r a 
i t _ e t . x m l <down> <down> <down> <down> <down> 
<return> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> C-SPC <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> M-w <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <f6> <down> C-SPC <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
M-w M-x <up> <up> <return>

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-- 
Sébastien Vauban