--- a/mercurial/localrepo.py	Fri Jan 10 21:41:28 2020 -0800
+++ b/mercurial/localrepo.py	Fri Jan 10 13:24:25 2020 -0800
@@ -1886,20 +1886,7 @@
         return self.vfs.reljoin(self.root, f, *insidef)
 
     def setparents(self, p1, p2=nullid):
-        with self.dirstate.parentchange():
-            copies = self.dirstate.setparents(p1, p2)
-            pctx = self[p1]
-            if copies:
-                # Adjust copy records, the dirstate cannot do it, it
-                # requires access to parents manifests. Preserve them
-                # only for entries added to first parent.
-                for f in copies:
-                    if f not in pctx and copies[f] in pctx:
-                        self.dirstate.copy(copies[f], f)
-            if p2 == nullid:
-                for f, s in sorted(self.dirstate.copies().items()):
-                    if f not in pctx and s not in pctx:
-                        self.dirstate.copy(None, f)
+        self[None].setparents(p1, p2)
 
     def filectx(self, path, changeid=None, fileid=None, changectx=None):
         """changeid must be a changeset revision, if specified.