bug#5297: [PATCH] vc: fixed test of symlinks on abbreviatable path

[Yuya Nishihara]

commit 51431c222c24bbe2919d3d98032f73723ebfccea
Author: Yuya Nishihara <yuya@tcha.org>
Date:   Sun Jan 3 14:12:56 2010 +0900

    vc: fixed test of symlinks on abbreviatable path
    
    buffer-file-truename is *abbreviated* truename, but buffer-file-name seems 
not,
    so we need to expand it.
    
    With abbreviated file-name, at least, vc-git and vc-hg are not detected
    as backend. This means symlinks to git/hg-managed files on HOME directory
    are not handled by vc-find-file-hook.

diff --git a/lisp/vc-hooks.el b/lisp/vc-hooks.el
index fabb35f..238fafe 100644
--- a/lisp/vc-hooks.el
+++ b/lisp/vc-hooks.el
@@ -890,8 +890,9 @@ current, and kill the buffer that visits the link."
          (set (make-local-variable 'backup-inhibited) t))
        ;; Let the backend setup any buffer-local things he needs.
        (vc-call-backend backend 'find-file-hook))
-       ((let ((link-type (and (not (equal buffer-file-name 
buffer-file-truename))
-                             (vc-backend buffer-file-truename))))
+       ((let* ((truename (expand-file-name buffer-file-truename))
+              (link-type (and (not (equal buffer-file-name truename))
+                              (vc-backend truename))))
          (cond ((not link-type) nil)   ;Nothing to do.
                ((eq vc-follow-symlinks nil)
                 (message