Fix JOSM-20388, attempting to duplicate a MapWithAI layer

Signed-off-by: Taylor Smock <tsmock@fb.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/backend/MapWithAILayer.java

@@ -41,6 +41,7 @@ import org.openstreetmap.josm.data.osm.UploadPolicy;
 import org.openstreetmap.josm.data.osm.Way;
 import org.openstreetmap.josm.gui.MainApplication;
 import org.openstreetmap.josm.gui.Notification;
+import org.openstreetmap.josm.gui.dialogs.layer.DuplicateAction;
 import org.openstreetmap.josm.gui.layer.Layer;
 import org.openstreetmap.josm.gui.layer.MainLayerManager.ActiveLayerChangeEvent;
 import org.openstreetmap.josm.gui.layer.MainLayerManager.ActiveLayerChangeListener;
@@ -149,8 +150,11 @@ public class MapWithAILayer extends OsmDataLayer implements ActiveLayerChangeLis
 
     @Override
     public Action[] getMenuEntries() {
+        Collection<Class<? extends Action>> forbiddenActions = Arrays.asList(LayerSaveAction.class,
+                LayerSaveAsAction.class, DuplicateAction.class, LayerGpxExportAction.class,
+                ConvertToGpxLayerAction.class);
         final List<Action> actions = Arrays.asList(super.getMenuEntries()).stream()
-                .filter(action -> !(action instanceof LayerSaveAction) && !(action instanceof LayerSaveAsAction))
+                .filter(action -> forbiddenActions.stream().noneMatch(clazz -> clazz.isInstance(action)))
                 .collect(Collectors.toCollection(ArrayList::new));
         if (actions.isEmpty()) {
             actions.add(new ContinuousDownloadAction(this));