bug#4179: vc-merge with svn: syntax error in revision arg.

[Dieter Wilhelm <dieter@duenenhof-wilhelm.de>]

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

Hi,

when running `vc-merge' for a subversion controlled file (this happens
also with Emacs 23.1.50 by the way) with an integer argument (I'd like
to specify two svn revision numbers), I'm tumbling into this:

svn: Syntax error in revision argument ':10'

(What I'd like to submit to svn is this: svn merge -r '10:8' ...)

vc-merge (in vc.el) thinks that an integer is a branch ID instead of a
svn revision # because of the following function:

(defun vc-branch-p (rev)
  "Return t if REV is a branch revision."
  (not (eq nil (string-match "\\`[0-9]+\\(\\.[0-9]+\\.[0-9]+\\)*\\'" rev))))

Thanks for your good work

       Dieter

------------------------------------------------------------
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In GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
 of 2008-11-09 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

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
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  shell-dirtrack-mode: t
  display-time-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<switch-frame> <switch-frame> <switch-frame> <switch-frame> 
<switch-frame> <switch-frame> <switch-frame> <f4> C-x 
C-f d i s c C-r C-s C-s <return> y C-x v l C-x v m 
1 0 <return> M-x r e p o <tab> r t <tab> <return>

Recent messages:
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Please type y, n, or !: 
Running svn in the background... done
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vc-do-command: Running svn...FAILED (status 1)
Making completion list...
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