X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fdatamodel%2FAlignment.java;fp=src%2Fjalview%2Fdatamodel%2FAlignment.java;h=3e0856a5d775040bb34c2508d5440d726f23c5b3;hb=06476b6d02ef690bf684905cba39eb7b5db7525b;hp=3ba35b6bf749e8b202797a4bbfab30b6d4c74cf1;hpb=8e77cd5b7bb56788c295dedef3ac29b3616bab19;p=jalview.git

diff --git a/src/jalview/datamodel/Alignment.java b/src/jalview/datamodel/Alignment.java
index 3ba35b6..3e0856a 100755
--- a/src/jalview/datamodel/Alignment.java
+++ b/src/jalview/datamodel/Alignment.java
@@ -1922,9 +1922,12 @@ public class Alignment implements AlignmentI
   }
 
   @Override
-  public void setHiddenColumns(HiddenColumns cols)
+  public boolean setHiddenColumns(HiddenColumns cols)
   {
+    boolean changed = cols == null ? hiddenCols != null
+            : !cols.equals(hiddenCols);
     hiddenCols = cols;
+    return changed;
   }
 
   @Override