more pleasant progress handling, although somewhat flawed

frontend/lib/modules/current_trip_landmarks_list.dart

@@ -7,14 +7,11 @@ import 'package:anyway/structs/landmark.dart';
 import 'package:anyway/structs/trip.dart';
 
 
-
-List<Widget> landmarksList(Trip trip) {
-  log("Trip ${trip.uuid} ${trip.landmarks.length} landmarks");
+// Returns a list of widgets that represent the landmarks matching the given selector
+List<Widget> landmarksList(Trip trip, {required bool Function(Landmark) selector}) {
   
   List<Widget> children = [];
 
-  log("Trip ${trip.uuid} ${trip.landmarks.length} landmarks");
-
   if (trip.landmarks.isEmpty || trip.landmarks.length <= 1 && trip.landmarks.first.type == typeStart ) {
     children.add(
       const Text("No landmarks in this trip"),
@@ -23,14 +20,16 @@ List<Widget> landmarksList(Trip trip) {
   }
 
   for (Landmark landmark in trip.landmarks) {
-    children.add(
-      LandmarkCard(landmark, trip),
-    );
-
-    if (landmark.next != null) {
+    if (selector(landmark)) {
       children.add(
-        StepBetweenLandmarks(current: landmark, next: landmark.next!)
+        LandmarkCard(landmark, trip),
       );
+
+      if (!landmark.visited && landmark.next != null) {
+        children.add(
+          StepBetweenLandmarks(current: landmark, next: landmark.next!)
+        );
+      }
     }
   }