(vc-find-revision): Set the parent buffer.

Use when instead of if.

lisp/ChangeLog

 2007-11-20  Dan Nicolaescu  <dann@ics.uci.edu>
 
+	* vc.el (vc-find-revision): Set the parent buffer.
+	Use when instead of if.
+
 	* progmodes/python.el (info-lookup-maybe-add-help):
 	* progmodes/ps-mode.el (doc-view-minor-mode):
 	* mail/emacsbug.el (Info-menu, Info-goto-node):

lisp/vc.el

@@ -2069,11 +2069,16 @@ If `F.~REV~' already exists, use it instead of checking it out again."
 		      (with-current-buffer filebuf
 			(vc-call find-revision file revision outbuf))))
 		  (setq failed nil))
-	      (if (and failed (file-exists-p filename))
+	      (when (and failed (file-exists-p filename))
 		(delete-file filename))))
 	  (vc-mode-line file))
 	(message "Checking out %s...done" filename)))
-    (find-file-noselect filename)))
+    (let ((result-buf (find-file-noselect filename)))
+      (with-current-buffer result-buf
+	;; Set the parent buffer so that things like 
+	;; C-x v g, C-x v l, ... etc work.
+	(setq vc-parent-buffer filebuf))
+      result-buf)))
 
 ;; Header-insertion code