--- a/hgext3rd/evolve/obshistory.py	Tue Jul 31 07:38:37 2018 -0500
+++ b/hgext3rd/evolve/obshistory.py	Thu Aug 02 01:31:02 2018 +0200
@@ -141,8 +141,16 @@
     We display the node, description (if available) and various information
     about obsolescence markers affecting it"""
 
-    def __init__(self, ui, repo, differ=None, diffopts=None, buffered=False):
-        super(obsmarker_printer, self).__init__(ui, repo, differ=differ, diffopts=diffopts, buffered=buffered)
+    def __init__(self, ui, repo, *args, **kwargs):
+
+        if kwargs.pop('obspatch', False):
+            if compat.changesetdiffer is None:
+                kwargs['matchfn'] = scmutil.matchall(repo)
+            else:
+                kwargs['differ'] = scmutil.matchall(repo)
+
+        super(obsmarker_printer, self).__init__(ui, repo, *args, **kwargs)
+        diffopts = kwargs.get('diffopts', {})
 
         # Compat 4.6
         if not util.safehasattr(self, "_includediff"):
@@ -415,11 +423,8 @@
     return sorted(seen), nodesucc, nodeprec
 
 def _debugobshistorygraph(ui, repo, revs, opts):
-    matchfn = None
-    if opts.get('patch'):
-        matchfn = scmutil.matchall(repo)
 
-    displayer = obsmarker_printer(ui, repo.unfiltered(), matchfn, opts, buffered=True)
+    displayer = obsmarker_printer(ui, repo.unfiltered(), obspatch=True, diffopts=opts, buffered=True)
     edges = graphmod.asciiedges
     walker = _obshistorywalker(repo.unfiltered(), revs, opts.get('all', False), opts.get('filternonlocal', False))
     compat.displaygraph(ui, repo, walker, displayer, edges)