copies: move file input processsing early

If we are to store the same kind of data outside of extra, we need to explicitly
prepare them before that.

On the long run, other storage (eg: sidedata) might use a different encoding to store this
information, since the constraint from extra does not apply to it.

Differential Revision: https://phab.mercurial-scm.org/D6937

mercurial/changelog.py

@@ -638,18 +638,26 b' class changelog(revlog.revlog):'
         if extra is not None:
             for name in ('p1copies', 'p2copies', 'filesadded', 'filesremoved'):
                 extra.pop(name, None)
+        if p1copies is not None:
+            p1copies = encodecopies(sortedfiles, p1copies)
+        if p2copies is not None:
+            p2copies = encodecopies(sortedfiles, p2copies)
+        if filesadded is not None:
+            filesadded = encodefileindices(sortedfiles, filesadded)
+        if filesremoved is not None:
+            filesremoved = encodefileindices(sortedfiles, filesremoved)
         if self._copiesstorage == 'extra':
             extrasentries = p1copies, p2copies, filesadded, filesremoved
             if extra is None and any(x is not None for x in extrasentries):
                 extra = {}
             if p1copies is not None:
-                extra['p1copies'] = encodecopies(sortedfiles, p1copies)
+                extra['p1copies'] = p1copies
             if p2copies is not None:
-                extra['p2copies'] = encodecopies(sortedfiles, p2copies)
+                extra['p2copies'] = p2copies
             if filesadded is not None:
-                extra['filesadded'] = encodefileindices(sortedfiles, filesadded)
+                extra['filesadded'] = filesadded
             if filesremoved is not None:
-                extra['filesremoved'] = encodefileindices(sortedfiles, filesremoved)
+                extra['filesremoved'] = filesremoved
 
         if extra:
             extra = encodeextra(extra)