# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2019-02-27 23:12:12
# Node ID 55919b96c02a0d7eeb41c1944b56760b7484178e
# Parent  e5ece0f46b402eb74bec86b2aeefd7f2e77d9944

discovery: avoid computing identical sets of heads twice

The very same set of heads is computed in the previous statement, it seems more
efficient to just copy that result.

diff --git a/mercurial/setdiscovery.py b/mercurial/setdiscovery.py
--- a/mercurial/setdiscovery.py
+++ b/mercurial/setdiscovery.py
@@ -193,7 +193,7 @@ class partialdiscovery(object):
         sample = set(repo.revs('heads(%ld)', revs))
 
         # update from heads
-        revsheads = set(repo.revs('heads(%ld)', revs))
+        revsheads = sample.copy()
         _updatesample(revs, revsheads, sample, repo.changelog.parentrevs)
 
         # update from roots