# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 2017-10-08 18:42:19
# Node ID 0314e02efa25f79a56a7456e76c5e42406644a29
# Parent  592a3cc1ebc41d84c0d5546ac2a450104563503f

configitems: register the 'experimental.maxdeltachainspan' config

diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -194,6 +194,9 @@ coreconfigitem('experimental', 'crecordt
 coreconfigitem('experimental', 'editortmpinhg',
     default=False,
 )
+coreconfigitem('experimental', 'maxdeltachainspan',
+    default=-1,
+)
 coreconfigitem('experimental', 'nonnormalparanoidcheck',
     default=False,
 )
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -601,7 +601,7 @@ class localrepository(object):
                                                    'aggressivemergedeltas')
         self.svfs.options['aggressivemergedeltas'] = aggressivemergedeltas
         self.svfs.options['lazydeltabase'] = not scmutil.gddeltaconfig(self.ui)
-        chainspan = self.ui.configbytes('experimental', 'maxdeltachainspan', -1)
+        chainspan = self.ui.configbytes('experimental', 'maxdeltachainspan')
         if 0 <= chainspan:
             self.svfs.options['maxdeltachainspan'] = chainspan
         mmapindexthreshold = self.ui.configbytes('experimental',