update more relevant widgets

com.unity.uiwidgets/Runtime/widgets/overscroll_indicator.cs

             }
 
             properties.add(new MessageProperty("show", showDescription));
-            properties.add(new DiagnosticsProperty<Color>("color", color, showName: false));
+            properties.add(new ColorProperty("color", color, showName: false));
         }
     }
 
             }
 
             if (notification is OverscrollNotification) {
-                _GlowController controller;
+                _GlowController controller = null;
                 OverscrollNotification _notification = notification as OverscrollNotification;
                 if (_notification.overscroll < 0.0f) {
                     controller = _leadingController;
                 }
                 else {
-                    throw new Exception("overscroll is 0.0f!");
+                    D.assert(false, () =>"over scroll cannot be 0.0f.");
                 }
 
                 bool isLeading = controller == _leadingController;

com.unity.uiwidgets/Runtime/widgets/primary_scroll_controller.cs

         public readonly ScrollController controller;
 
         public static ScrollController of(BuildContext context) {
-            PrimaryScrollController result =
-                (PrimaryScrollController) context.inheritFromWidgetOfExactType(typeof(PrimaryScrollController));
-            return result == null ? null : result.controller;
+            PrimaryScrollController result = context.dependOnInheritedWidgetOfExactType<PrimaryScrollController>();
+            return result?.controller;
         }
 
         public override bool updateShouldNotify(InheritedWidget oldWidget) {