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

[Óscar Fuentes]

Dan Nicolaescu <dann@ics.uci.edu> writes:

> ofv@wanadoo.es. "(Óscar" Fuentes) writes:
>
>   > 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".
>
> Can you please describe step by step the actions necessary to reproduce
> this starting from emacs -Q?

emacs -Q

C-x C-f some-versioned-unmodified-file
do some edition
C-x C-s (the VC status modeline indicator changes from `-' to `:')
undo previous edition
C-x C-s

Now you just turned the file to its original state and is unmodified as
far as the version control system is concerned, but the VC modeline
keeps showing `:' (for example Bzr:836) indicating that the file is
edited. After saving a versioned file, VC should check if the VC backend
flags the file as edited and update the modeline accordingly.

-- 
Óscar