diff -r 468339891670 -r ac30adb260ea mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Mon Apr 11 12:06:18 2016 -0700
+++ b/mercurial/cmdutil.py	Fri Apr 08 16:42:43 2016 +0200
@@ -2240,6 +2240,10 @@
                                 styles[key])
         if not styles[key]:
             styles[key] = None
+
+    # experimental config: experimental.graphshorten
+    state['graphshorten'] = ui.configbool('experimental', 'graphshorten')
+
     for rev, type, ctx, parents in dag:
         char = formatnode(repo, ctx)
         copies = None