JAL-2172 handle case where column selection is not ordered

[jalview.git] / src / jalview / analysis / Grouping.java

diff --git a/src/jalview/analysis/Grouping.java b/src/jalview/analysis/Grouping.java
index 51a818f..ddf483b 100644 (file)
--- a/src/jalview/analysis/Grouping.java
+++ b/src/jalview/analysis/Grouping.java
@@ -25,6 +25,7 @@ import jalview.datamodel.SequenceGroup;
 import jalview.datamodel.SequenceI;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -134,7 +135,12 @@ public class Grouping
     {
       spos[i++] = pos.intValue();
     }
-    ;
+
+    /*
+     * ensure column selection is in ascending order
+     */
+    Arrays.sort(spos);
+
     for (i = 0; i < sequences.length; i++)
     {
       int slen = sequences[i].getLength();