Finish importer, add applicable import layers to every theme by default

UI/ImportFlow/ImportUtils.ts

@@ -0,0 +1,28 @@
+import {UIEventSource} from "../../Logic/UIEventSource";
+import {GeoOperations} from "../../Logic/GeoOperations";
+
+export class ImportUtils {
+    public static partitionFeaturesIfNearby(toPartitionFeatureCollection: ({ features: any[] }), compareWith: UIEventSource<{ features: any[] }>, cutoffDistanceInMeters: UIEventSource<number>): UIEventSource<{ hasNearby: any[], noNearby: any[] }> {
+        return compareWith.map(osmData => {
+            if (osmData?.features === undefined) {
+                return undefined
+            }
+            const maxDist = cutoffDistanceInMeters.data
+
+
+            const hasNearby = []
+            const noNearby = []
+            for (const toImportElement of toPartitionFeatureCollection.features) {
+                const hasNearbyFeature = osmData.features.some(f =>
+                    maxDist >= GeoOperations.distanceBetween(toImportElement.geometry.coordinates, GeoOperations.centerpointCoordinates(f)))
+                if (hasNearbyFeature) {
+                    hasNearby.push(toImportElement)
+                } else {
+                    noNearby.push(toImportElement)
+                }
+            }
+
+            return {hasNearby, noNearby}
+        }, [cutoffDistanceInMeters]);
+    }
+}