diff -r 26a4e46af2bc -r ff17dff99295 mercurial/mdiff.py
--- a/mercurial/mdiff.py	Mon Sep 26 23:28:57 2016 +0900
+++ b/mercurial/mdiff.py	Tue Sep 27 14:46:34 2016 +0200
@@ -113,12 +113,11 @@
         s1 = i1
         s2 = i2
 
-def allblocks(text1, text2, opts=None, lines1=None, lines2=None, refine=False):
+def allblocks(text1, text2, opts=None, lines1=None, lines2=None):
     """Return (block, type) tuples, where block is an mdiff.blocks
     line entry. type is '=' for blocks matching exactly one another
     (bdiff blocks), '!' for non-matching blocks and '~' for blocks
-    matching only after having filtered blank lines. If refine is True,
-    then '~' blocks are refined and are only made of blank lines.
+    matching only after having filtered blank lines.
     line1 and line2 are text1 and text2 split with splitnewlines() if
     they are already available.
     """