vc, diff and scroll window

vc, diff and scroll window

[Matthias Meulien]

In GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-03-22 on raven, modified by Debian
configured using `configure  i386-debian-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes --with-x=yes --with-x-toolkit=athena --without-gif'
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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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

Suppose I have a file under version control, and say that that file
has been changed and saved without being commited. When I press C-xvu
(calling vc-revert-buffer) from a buffer visiting that file, the
corresponding window get split a diff buffer is shown and Emacs ask
'Discard changes' (the minibuffer get selected).

Here are two bugs related to this situation:

1. The diff buffer is not fontified.

2. While the minibuffer is selected, M-C-v (scroll-other-window)
   doesn't work, so one cannot scroll the window containing the diff
   buffer.

Thank you for your attention,
-- 
Matthias Meulien

Re: vc, diff and scroll window

[Kevin Rodgers]

Matthias Meulien wrote:
 > Suppose I have a file under version control, and say that that file
 > has been changed and saved without being commited. When I press C-xvu
 > (calling vc-revert-buffer) from a buffer visiting that file, the
 > corresponding window get split a diff buffer is shown and Emacs ask
 > 'Discard changes' (the minibuffer get selected).
 >
 > Here are two bugs related to this situation:
 >
 > 1. The diff buffer is not fontified.

Is it in Diff mode (confirmed via `C-h v major-mode')?

 > 2. While the minibuffer is selected, M-C-v (scroll-other-window)
 >    doesn't work, so one cannot scroll the window containing the diff
 >    buffer.

A simple addition to vc-version-diff should fix that:

*** /usr/local/emacs-21.3/lisp/vc.el.orig	Mon Jan 20 04:03:30 2003
--- /usr/local/emacs-21.3/lisp/vc.el	Tue Jul 13 09:38:15 2004
***************
*** 2500,2505 ****
--- 2500,2506 ----
   	(vc-exec-after `(message nil))
   	(when status
   	  (unwind-protect
+ 	      (setq minibuffer-scroll-window win)
   	      (unless (yes-or-no-p "Discard changes? ")
   		(error "Revert canceled"))
   	    (select-window win)

-- 
Kevin Rodgers

Re: vc, diff and scroll window

[Richard Stallman]

The change seems reasonable technically.  Unfortunately, we've reached
the limit on how much of your code we can install without getting
suitable legal papers from you.

vc, diff and scroll window

[Matthias]

Hi,

Suppose I have a buffer visiting a file which is under version
control, and say that that file as been changed and saved. When I
press C-xvu (calling vc-revert-buffer), the selected window get split,
a (curiously, unfontified) diff buffer is shown, and Emacs ask
`Discard changes' (the minibuffer is selected). 

Then M-C-v (scroll-other-window) doesn't work, so I can not scroll the
diff buffer!

Strange no? Is it a bug? What about the fontificationt problem?

I am using GNU Emacs 21.3.1. Thank you for your help.
-- 
Matthias

Re: vc, diff and scroll window

[Stefan Monnier]

> Suppose I have a buffer visiting a file which is under version
> control, and say that that file as been changed and saved. When I
> press C-xvu (calling vc-revert-buffer), the selected window get split,
> a (curiously, unfontified) diff buffer is shown, and Emacs ask
> `Discard changes' (the minibuffer is selected). 

> Then M-C-v (scroll-other-window) doesn't work, so I can not scroll the
> diff buffer!

> Strange no? Is it a bug? What about the fontificationt problem?

These are both bugs.  Please M-x report-emacs-bug RET.


        Stefan