From 8f232a91739011ec2906a25a583e69f367e0bfe8 Mon Sep 17 00:00:00 2001
From: Julia Beliaeva <Julia.Beliaeva@jetbrains.com>
Date: Thu, 20 Oct 2016 05:10:52 +0300
Subject: [PATCH] [git] more diagnostic for EA-62663

---
 plugins/git4idea/src/git4idea/history/GitHistoryUtils.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/plugins/git4idea/src/git4idea/history/GitHistoryUtils.java b/plugins/git4idea/src/git4idea/history/GitHistoryUtils.java
index b2f721479513..74e7cc0066f5 100644
--- a/plugins/git4idea/src/git4idea/history/GitHistoryUtils.java
+++ b/plugins/git4idea/src/git4idea/history/GitHistoryUtils.java
@@ -840,7 +840,9 @@ public class GitHistoryUtils {
         Collection<VcsRef> refsInRecord = parseRefs(record.getRefs(), commit.getId(), factory, root);
         for (VcsRef ref : refsInRecord) {
           if (!refs.add(ref)) {
-            LOG.error("Adding duplicate element to the set");
+            // relying on the fact that intersection method puts elements of the first argument into the result
+            VcsRef otherRef = ContainerUtil.getFirstItem(ContainerUtil.intersection(refs, Collections.singleton(ref)));
+            LOG.error("Adding duplicate element " + ref + " to the set containing " + otherRef);
           }
         }
         return commit;