mercurial/context.py

--- a/mercurial/context.py	Thu Jul 23 23:41:29 2015 +0900
+++ b/mercurial/context.py	Mon Jan 25 15:48:35 2016 -0800
@@ -142,7 +142,7 @@
                 removed.append(fn)
             elif flag1 != flag2:
                 modified.append(fn)
-            elif self.rev() is not None:
+            elif node2 != _newnode:
                 # When comparing files between two commits, we save time by
                 # not comparing the file contents when the nodeids differ.
                 # Note that this means we incorrectly report a reverted change