Polyline doesn't recompose when points change

Environment details

Android API 26 com.google.maps.android:maps-compose:2.1.0

Steps to reproduce

1. Create a map with a MutableStateList of points
2. Use the points to draw markers and a polyline between them
3. Add functionality to add or remove points from the list
4. Observe that the markers update, but the polyline does not

Code example

@Composable
fun MapScreen(){
    val waypoints = remember{ mutableStateListOf<LatLng>()}
    Map(waypoints) {
        waypoints.add(it)
    }
}

@Composable
private fun Map(
    waypoints: List<LatLng>,
    modifier: Modifier = Modifier,
    onMapClicked: (latlng: LatLng) -> Unit
){
    GoogleMap(
        modifier = modifier,
        onMapClick = onMapClicked,
    ){
        waypoints.forEach {
            Marker(state = MarkerState(position = it))
        }
        Polyline(waypoints)
    }
}

[arriolac]

I believe the issue might be between the interaction of mutableStateListOf and a ComposeNode’s Updater. Because Polyline as currently implemented should work. I’ve opened an issue in the public issue tracker for Compose here: https://issuetracker.google.com/issues/232271525

[Sergiyss]

Is the question still open? Help me. the last Polyline is not updated, but markers are drawn according to the route.

@Composable
fun MapScreen(){
  val path  = chvm.pathResult.observeAsState()
    var waypoints by remember{ mutableStateOf<List<LatLng>>(value = listOf())}

    if(path.value?.path?.size != null){
        Map(path.value?.path!!) {
            waypoints = waypoints + it
        }
    }
}

@Composable
private fun Map(
    waypoints: List<LatLng>,
    modifier: Modifier = Modifier,
    onMapClicked: (latlng: LatLng) -> Unit
){
    GoogleMap(
        modifier = modifier,
        onMapClick = onMapClicked,
    ){
        waypoints.forEach {
            Marker(state = MarkerState(position = it))
        }
        Polyline(waypoints)
    }
}