--- a/hgext3rd/evolve/stablesort.py	Wed Dec 20 16:20:26 2017 +0100
+++ b/hgext3rd/evolve/stablesort.py	Sun Dec 10 02:46:05 2017 +0100
@@ -329,6 +329,12 @@
         result.reverse()
         return result
 
+    def getjumps(self, repo, rev):
+        if self._jumps[rev] is None:
+            # still won't load anything if rev is not a merge
+            self.get(repo, rev) # we can be smarter here
+        return self._jumps[rev]
+
     def walkfrom(self, repo, head):
         tiebreaker = _mergepoint_tie_breaker(repo)
         cl = repo.changelog