Check if sequence is in group before adding

diff --git a/src/jalview/datamodel/SequenceGroup.java b/src/jalview/datamodel/SequenceGroup.java
index 051db30..6bccec3 100755 (executable)
--- a/src/jalview/datamodel/SequenceGroup.java
+++ b/src/jalview/datamodel/SequenceGroup.java
@@ -71,7 +71,8 @@ public class SequenceGroup
 \r
   public void addSequence(SequenceI s)\r
   {\r
-    sequences.addElement(s);\r
+    if(!sequences.contains(s))\r
+      sequences.addElement(s);\r
   }\r
 \r
   public void deleteSequence(SequenceI s)\r