bug#2080: 23.0.60; buffer-file-coding-system not set in RMAIL buffer

The local variable buffer-file-coding-system is not set in
RMAIL buffer.  The function rmail-docode-region does set
buffer-file-coding-system but that information is lost after
that.

---
Kenichi Handa
[email protected]

In GNU Emacs 23.0.60.3 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2009-01-26 on etlken
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
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: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  display-time-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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
C-p C-b C-SPC M-f M-f M-f M-f <escape> w C-x o C-y 
C-a ( C-e ) : SPC F i x SPC p r e v i o u s SPC c h 
a n g e . <return> C-c C-c C-n C-n C-n C-n C-M-x C-x 
b C-g M-x b y t e SPC c SPC SPC <return> <return> C-x 
b <return> p R <return> S <return> C-x b * m <tab> 
<return> C-a M-f M-f M-f SPC a SPC n e w SPC f u n 
c t i o n C-e <escape> q SPC SPC SPC I f SPC y o u 
SPC f i n d SPC a SPC b e t t e r SPC n a m e M-b M-b 
M-b M-b M-b M-b C-b C-b C-b C-b SPC a n d SPC u s e 
SPC i t SPC t o SPC f i x SPC b r o k e n SPC C-o C-o 
r m a i l - g e t - c o d i n g - s y s t e m C-h f 
<return> C-x 1 . <escape> C-g <escape> q C-a C-n C-n 
C-k C-u 7 C-c C-w <escape> < C-v C-l C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n <escape> < C-c C-c > C-x b 
C-g C-x b <return> C-s r m a i l - C-a C-x b <return> 
h C-r r m a i l C-r C-a <escape> > C-r C-r C-x C-x 
C-p <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <down-mouse-1> <mouse-1> M-x r e p o r 
t <tab> <return> M-p M-p C-k C-g C-x b <return> C-s 
r m a i l - d e c o d e C-a C-u C-v C-x b C-g M-x M-p 
<return>

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