From ad94fe2f24935ae35a6531d52b706cea889196d2 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Mon, 29 Jun 2020 10:25:06 +0100
Subject: [PATCH] JAL-3400 prevent duplications in View Chain menu

---
 src/jalview/gui/StructureViewerBase.java |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/jalview/gui/StructureViewerBase.java b/src/jalview/gui/StructureViewerBase.java
index 77ba38d..1bb651a 100644
--- a/src/jalview/gui/StructureViewerBase.java
+++ b/src/jalview/gui/StructureViewerBase.java
@@ -1053,7 +1053,10 @@ public abstract class StructureViewerBase extends GStructureViewer
       repaint();
       return;
     }
-    setChainMenuItems(binding.getChainNames());
+    synchronized (chainMenu)
+    {
+      setChainMenuItems(binding.getChainNames());
+    }
 
     this.setTitle(binding.getViewerTitle(getViewerName(), true));
 
-- 
1.7.10.2