--- a/mercurial/configitems.py	Wed Jul 12 23:36:28 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:44:05 2017 +0200
@@ -163,6 +163,9 @@
 coreconfigitem('progress', 'estimate',
     default=2,
 )
+coreconfigitem('progress', 'width',
+    default=dynamicdefault,
+)
 coreconfigitem('server', 'bundle1',
     default=True,
 )