diff -r 090e5f3900b7 -r 682f73fa924a mercurial/configitems.py
--- a/mercurial/configitems.py	Sat Oct 13 12:58:24 2018 +0000
+++ b/mercurial/configitems.py	Sat Oct 13 11:52:30 2018 +0200
@@ -616,9 +616,6 @@
 coreconfigitem('experimental', 'sshserver.support-v2',
     default=False,
 )
-coreconfigitem('experimental', 'spacemovesdown',
-    default=False,
-)
 coreconfigitem('experimental', 'sparse-read',
     default=False,
 )