changelog: keep track of duplicated node in the transaction adding them

The transaction is already tracking the new nodes. We now tracks the
"duplicates" in the same location.

mercurial/changelog.py

@@ -545,3 +545,10 b' class changelog(revlog.revlog):'
         just to access this is costly."""
         extra = self.read(rev)[5]
         return encoding.tolocal(extra.get("branch")), 'close' in extra
+
+    def _nodeduplicatecallback(self, transaction, node):
+        # keep track of revisions that got "re-added", eg: unbunde of know rev.
+        #
+        # We track them in a list to preserve their order from the source bundle
+        duplicates = transaction.changes.setdefault('revduplicates', [])
+        duplicates.append(self.rev(node))