all these changes

frontend/node_modules/react-leaflet/lib/FeatureGroup.js

@@ -0,0 +1,9 @@
+import { createElementObject, createPathComponent, extendContext } from '@react-leaflet/core';
+import { FeatureGroup as LeafletFeatureGroup } from 'leaflet';
+export const FeatureGroup = createPathComponent(function createFeatureGroup({ children: _c , ...options }, ctx) {
+    const group = new LeafletFeatureGroup([], options);
+    return createElementObject(group, extendContext(ctx, {
+        layerContainer: group,
+        overlayContainer: group
+    }));
+});