diff -r 4d5d493ea54a -r be00b61e4c4a mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jun 30 03:42:30 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:44:01 2017 +0200
@@ -146,6 +146,9 @@
 coreconfigitem('patch', 'fuzz',
     default=2,
 )
+coreconfigitem('progress', 'assume-tty',
+    default=False,
+)
 coreconfigitem('server', 'bundle1',
     default=True,
 )