diff -r abeb17a9e313 -r a2dfe82f27a0 hgext/obsolete.py
--- a/hgext/obsolete.py	Tue Aug 21 10:10:44 2012 +0200
+++ b/hgext/obsolete.py	Mon Aug 20 19:12:20 2012 +0200
@@ -487,12 +487,15 @@
 # - push warning
 
 ### Cache computation
+latediff = 1  # flag to prevent taking late comer fix into account
 
 @cachefor('latecomer')
 def _computelatecomerset(repo):
     """the set of rev trying to obsolete public revision"""
-    query = 'allsuccessors(public()) - obsolete() - public()'
-    return set(repo.revs(query))
+    candidates = _allsuccessors(repo, repo.revs('public()'),
+                                                haltonflags=latediff)
+    query = '%ld - obsolete() - public()'
+    return set(repo.revs(query, candidates))
 
 @cachefor('conflicting')
 def _computeconflictingset(repo):
@@ -709,14 +712,19 @@
                     cs.add(sr)
     return cs
 
-def _allsuccessors(repo, s):  # XXX we need a better naming
-    """transitive successors of a subset"""
+def _allsuccessors(repo, s, haltonflags=0):  # XXX we need a better naming
+    """transitive successors of a subset
+
+    haltonflags allows to provide flags which prevent the evaluation of a
+    marker.  """
     toproceed = [repo[r].node() for r in s]
     seen = set()
     allobjects = repo.obsstore.precursors
     while toproceed:
         nc = toproceed.pop()
         for mark in allobjects.get(nc, ()):
+            if mark[2] & haltonflags:
+                continue
             for sub in mark[1]:
                 if sub == nullid:
                     continue # should not be here!