bug#4515: 23.1.50; Reverting changes on versioned file does not revert vc modeline status

[ofv@wanadoo.es.=?UTF-8?Q? (=C3=93scar?= Fuentes)]

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:

When a modified versioned file is edited in such a way that the
modifications undoes previous changes to the file, after saving it the
VC-dired buffer for the working copy is automatically updated showing
that the status of the file is "up to date", but the VC modeline for the
buffer that visits the file does not change and keeps indicating that
the file state is "locally modified".

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/local/share/emacs/23.1.50/etc/DEBUG for instructions.


In GNU Emacs 23.1.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2009-09-06 on qcore
Windowing system distributor `The X.Org Foundation', version 11.0.10600000
configured using `configure  '--with-x-toolkit=lucid''

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: C++/lah

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  show-paren-mode: t
  diff-auto-refine-mode: t
  iswitchb-mode: t
  tooltip-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
  column-number-mode: t
  line-number-mode: t
  abbrev-mode: t

Recent input:
n d ( ) SPC ) ; } <return> / / - - - - - - - - - - 
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<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> M-d <up> 
<up> <up> <return> / / - - - - - - - - - - - - - - 
- - <backspace> <backspace> <backspace> <backspace> 
- <return> <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-x C-s M-x c m a k e C-g 
M-x s e t SPC a c t i v e SPC c o m <tab> <return> 
g c c <return> M-x c m a k e <return> <f2> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> C-x 
b e x e <return> C-r t y p e d e f C-a C-x b <return> 
M-d <right> C-y C-x C-s <f9> <f2> C-e <C-left> <C-left> 
<backspace> - > <f2> <up> C-a C-k C-k C-x C-s <f9> 
<down> <down> <down> C-e <C-left> <C-left> <C-right> 
<right> <right> M-d f f i c g C-x C-s <f9> C-x o <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> <return> <down> <right> <right> M-d C-d C-x 
C-s <f9> <help-echo> M-x g n u s <return> <return> 
d q <down> <return> d q q y M-x g n u s <return> q 
y <help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

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-- 
Óscar Fuentes
Desarrollo de Software