anchor.diff:    ValueListenable<IsolateRef> get mainIsolate => _mainIsolate;
     final _mainIsolate = ValueNotifier<IsolateRef>(null);
   
  +  final _isolateRunnableCompleters = <String, Completer<void>>{};
  +
     Future<void> init(List<IsolateRef> isolates) async {
       // Re-initialize isolates when VM developer mode is enabled/disabled to
       // display/hide system isolates.
  
positive.code: 
    Future<void> _loadIsolateState(IsolateRef isolateRef) async {
      final service = _service;
      final isolate = await _service.getIsolate(isolateRef.id);
      if (service != _service) return;
      final state = _isolateStates[isolateRef];
      if (state != null) {
  
negative.code:     _isolateIndexMap.clear();
      _clearIsolateStates();
      _mainIsolate.value = null;
      _isolateRunnableCompleters.clear();
    }
  
    void _clearIsolateStates() {
  