Merge branch 'bug/JAL-3099alignmentVisibleWidth' into merge/JAL-3099

[jalview.git] / src / jalview / datamodel / Alignment.java

diff --git a/src/jalview/datamodel/Alignment.java b/src/jalview/datamodel/Alignment.java
index 11d28a0..0f51b7e 100755 (executable)
--- a/src/jalview/datamodel/Alignment.java
+++ b/src/jalview/datamodel/Alignment.java
@@ -1908,9 +1908,12 @@ 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