Index: trunk/src/org/openstreetmap/josm/gui/dialogs/LayerListDialog.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/LayerListDialog.java	(revision 6085)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/LayerListDialog.java	(revision 6086)
@@ -1636,5 +1636,5 @@
             return false;
 
-        return Main.map.mapView.getAllLayersAsList().indexOf(l) >= 0;
+        return Main.map.mapView.getAllLayersAsList().contains(l);
     }