bug#2229: 23.0.90; Revisiting a modified mbox file shows incorrect buffer

[Eli Zaretskii <eliz@gnu.org>]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

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

Assuming that FOO is an mbox-format file:

  emacs -Q
  C-u M-x rmail RET FOO RET

outside Emacs, type "touch FOO" to modify the file FOO behind Emacs's
back.  Back inside Emacs, type "C-u M-x rmail RET FOO RET" again.
Emacs asks whether to discard edits: answer "yes".  Emacs will say "No
mail." (why?) and you will be presented with the contents of the
buffer that holds the entire message collection, not the buffer
showing a single mail message.

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
d:/gnu/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.90.1 (i386-mingw-nt5.1.2600)
 of 2009-02-07 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

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: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default-enable-multibyte-characters: t

Major mode: RMAIL

Minor modes in effect:
  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-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <help-echo> C-u M-x r m a i l <return> 
~ / d a <tab> m a i l . n e w <return> C-u M-x <up> 
<return> <up> <return> y e s <return> M-x r e p o <tab> 
r <tab> <return>

Recent messages:
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