clfilter: use changelog to iterate over the repo in branchpoint
Otherwise filtered changesets may cause false positives in `branchpoint()`.
--- a/mercurial/revset.py Fri Oct 12 10:52:33 2012 +0200
+++ b/mercurial/revset.py Mon Oct 15 17:42:40 2012 +0200
@@ -929,7 +929,7 @@
return []
baserev = min(subset)
parentscount = [0]*(len(repo) - baserev)
- for r in xrange(baserev + 1, len(repo)):
+ for r in cl.revs(start=baserev + 1):
for p in cl.parentrevs(r):
if p >= baserev:
parentscount[p - baserev] += 1