--- a/.emacs-my	Sun Oct 28 13:34:03 2012 +0200
+++ b/.emacs-my	Sun Oct 28 13:38:38 2012 +0200
@@ -1871,7 +1871,10 @@
 (setq ediff-window-setup-function 'ediff-setup-windows-plain)
 (setq ediff-split-window-function 'split-window-vertically)
 
+(defun my-diff-auto-refine-mode-on () (diff-auto-refine-mode 1))
+
 (when window-system
+  (add-hook 'diff-mode-hook 'my-diff-auto-refine-mode-on)
   (eval-after-load 'diff-mode
     '(progn
        (set-face-foreground 'diff-added-face "DarkGreen")