--- a/mercurial/cmdutil.py	Sat May 12 15:41:27 2012 +0200
+++ b/mercurial/cmdutil.py	Sun May 13 13:19:46 2012 +0200
@@ -1345,7 +1345,7 @@
                     a = ctx.filectx(f)
                     if f in base.manifest():
                         b = base.filectx(f)
-                        return (a.data() == b.data()
+                        return (not a.cmp(b)
                                 and a.flags() == b.flags())
                     else:
                         return False