mercurial/filemerge.py

--- a/mercurial/filemerge.py	Mon Jun 09 23:37:36 2014 -0700
+++ b/mercurial/filemerge.py	Tue Jul 29 11:55:01 2014 -0700
@@ -191,7 +191,8 @@
                                     (tool, premerge, _valid))
 
     if premerge:
-        r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels)
+        r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels,
+                                    no_minimal=True)
         if not r:
             ui.debug(" premerge successful\n")
             return 0