bug#6447: 23.1; revert-buffer in *vc-diff*

[Chong Yidong]

Juri Linkov <juri@jurta.org> writes:

> Like the command `diff' after calling `diff-mode' sets
> `revert-buffer-function' to lambda with its function arguments,
> `vc-diff-internal' could do the same:
>
> === modified file 'lisp/vc/vc.el'
> --- lisp/vc/vc.el     2010-06-11 19:09:57 +0000
> +++ lisp/vc/vc.el     2010-06-19 14:51:14 +0000
> @@ -1547,6 +1547,9 @@ (defun vc-diff-internal (async vc-filese
>            (message "%s" (cdr messages))
>            nil)
>        (diff-mode)
> +      (set (make-local-variable 'revert-buffer-function)
> +        `(lambda (ignore-auto noconfirm)
> +           (vc-diff-internal ,async ',vc-fileset ,rev1 ,rev2 ,verbose)))
>        ;; Make the *vc-diff* buffer read only, the diff-mode key
>        ;; bindings are nicer for read only buffers. pcl-cvs does the
>        ;; same thing.

Looks like a fine idea, please go ahead.