Issue when add multiple same Statefulwidget Marker

[lidroider]

Add more than 1 Marker, which is a same StatefulWidget.
In this case, we have more than 1 StatefulWidget and each StatefulWidget can have more than 1 it's State.
The problem occurs when scroll or move map, the State of StatefulWidget can rebuild and flutter maybe map StatefulWidget and State not exactly.
I try to add key to the StatefulWidget, flutter maybe rebuild State and map to StatefulWidget exactly but it rebuild a completely new State, so they lost the previous State of the StatefulWidget.

In my case, the StatefulWidget subscribe to the ValueNotifier to receive notification from server and change icon. When I scroll or move map the the notification on StatefulWidget change to another StatefulWidget. It likes the StatefulWidget changed to notification status become normal StatefulWidget and another normal StatefulWidget become notification status StatefulWidget

I find out the code if (!latlngBounds.contains(markerOpt.point)) {continue;} in marker_layer.dart can be a reason. So I fork to (https://github.com/lidroider/flutter_map), add alwaysKeepWidget to always add StatefulWidget Marker to Map.

So anyone have any idea or other solution for this issue?

p/s: sorry for my English

[johnpryan]

It sounds like you are trying to use 2 Markers that use the same StatefulWidget. It sounds like the key you are using needs to be unique for both markers.

A new widget will only be used to update an existing element if its key is the same as the key of the current widget associated with the element.

https://docs.flutter.io/flutter/foundation/Key-class.html

I'm not sure what your app looks like, but you should try to use different, unique Key objects for each marker so that they don't use the same State.