Add methods to prevent mass additions

Signed-off-by: Taylor Smock <taylor.smock@kaart.com>

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

@@ -16,6 +16,7 @@ import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.SwingConstants;
 
+import org.openstreetmap.josm.actions.ExpertToggleAction;
 import org.openstreetmap.josm.data.Bounds;
 import org.openstreetmap.josm.data.osm.DataSet;
 import org.openstreetmap.josm.data.osm.DownloadPolicy;
@@ -187,4 +188,15 @@ public class MapWithAILayer extends OsmDataLayer implements ActiveLayerChangeLis
         super.onPostDownloadFromServer();
         GetDataRunnable.cleanup(getDataSet(), bounds);
     }
+
+    @Override
+    public void selectionChanged(SelectionChangeEvent event) {
+        final int maximumAdditionSelection = MapWithAIPreferenceHelper.getMaximumAddition();
+        if (maximumAdditionSelection < event.getSelection().size()
+                && (MapWithAIPreferenceHelper.getMaximumAddition() != 0 || !ExpertToggleAction.isExpert())) {
+            getDataSet().setSelected(event.getSelection().stream().distinct().limit(maximumAdditionSelection)
+                    .collect(Collectors.toList()));
+        }
+        super.selectionChanged(event);
+    }
 }

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

@@ -113,7 +113,7 @@ public final class MapWithAIPreferenceHelper {
         if ((mapWithAILayer != null) && (mapWithAILayer.getMaximumAddition() != null)) {
             defaultReturn = mapWithAILayer.getMaximumAddition();
         }
-        return defaultReturn;
+        return defaultReturn > DEFAULT_MAXIMUM_ADDITION * 10 ? DEFAULT_MAXIMUM_ADDITION * 10 : defaultReturn;
     }
 
     /**