copies: fix duplicatecopies() with overlay context The reasoning for this check is in 78d760aa3607 (duplicatecopies: do not mark items not in the dirstate as copies, 2013-03-28). The check was then moved to workingfilectx in 754b5117622f (context: add workingfilectx.markcopied, 2017-10-15) and no corresponding check was added later when overlayworkingfilectx was added. Rather than adding the check there, this patch adds a more generic check on the callers side and removes the check in workingfilectx.markcopied(). Differential Revision: https://phab.mercurial-scm.org/D6380

--- a/mercurial/context.py	Wed May 15 16:10:52 2019 -0700
+++ b/mercurial/context.py	Wed Jan 09 15:54:45 2019 -0800
@@ -1773,8 +1773,7 @@
 
     def markcopied(self, src):
         """marks this file a copy of `src`"""
-        if self._repo.dirstate[self._path] in "nma":
-            self._repo.dirstate.copy(src, self._path)
+        self._repo.dirstate.copy(src, self._path)
 
     def clearunknown(self):
         """Removes conflicting items in the working directory so that