--- a/.emacs-my	Thu Dec 14 01:05:24 2017 +0200
+++ b/.emacs-my	Sun Jan 28 16:34:44 2018 +0200
@@ -2550,6 +2550,9 @@
 
 (global-set-key (kbd "C-x v D") 'my-vc-root-diff)
 
+(setq vc-hg-diff-switches (list "-U" "7"))
+(setq vc-git-diff-switches (list "-U7"))
+
 (when window-system
   (setq
    vc-annotate-very-old-color "#0b5b20"