feat(ui): filter for station arrivals after start

lib/api_handler.dart

@@ -202,6 +202,7 @@ class ApiHandler {
     int? fromIdx,
     String? toId,
     int? toIdx,
+    String? startStationId,
   }) async {
     String urlPath = '/api/fahrinfo/latest/journeyDetail';
     Uri url = Uri.https(baseUrl, urlPath, {
@@ -216,7 +217,7 @@ class ApiHandler {
     );
     final httpPackageJson =
         json.decode(jsonResponse.body) as Map<String, dynamic>;
-    final DepartureList = httpPackageJson["Stops"]["Stop"]
+    Iterable<Departure> DepartureList = httpPackageJson["Stops"]["Stop"]
         .map(
           (x) => Departure.fromJson(
             // needed because I'm too lazy to write a second mostly identical
@@ -224,9 +225,17 @@ class ApiHandler {
             _expandDeparturesJson(httpPackageJson, x, ["ref", "Product"]),
           ),
         )
-        .toList()
         .cast<Departure>();
-    return DepartureList;
+
+    // preferably this happens always?
+    if (startStationId != null) {
+      // show Stations after the one we are at
+      return DepartureList.skipWhile(
+        (x) => x.stationId != startStationId,
+      ).skip(1).toList();
+    }
+
+    return DepartureList.toList().cast<Departure>();
   }
 
   // workaround for the fact that json from tripDetail and DepartureBoard are

lib/main.dart

@@ -327,7 +327,10 @@ class _ChooseArrivalPageState extends State<ChooseArrivalPage> {
   Departure? _selectedDeparture;
 
   void loadArrivals(String ref) async {
-    departureList = await ApiHandler.tripDetail(ref);
+    departureList = await ApiHandler.tripDetail(
+      ref,
+      startStationId: widget.departure.stationId,
+    );
     setState(() {});
   }