fix review

Samples/UIWidgetsSamples_2019_4/Assets/UIWidgetsGallery/demo/cupertino/cupertino_alert_demo.cs

           navigationBar:  new CupertinoNavigationBar(
             middle: new Text("Alerts"),
             previousPageTitle: "Cupertino"
-            //trailing: CupertinoDemoDocumentationButton(CupertinoAlertDemo.routeName)
+            //,trailing: CupertinoDemoDocumentationButton(CupertinoAlertDemo.routeName)
           ),
           child: new DefaultTextStyle(
             style: CupertinoTheme.of(context).textTheme.textStyle,

com.unity.uiwidgets/Runtime/cupertino/route.cs

 
         public readonly WidgetBuilder builder;
         public readonly string title;
+        
         ValueNotifier<string> _previousTitle;
 
         public ValueListenable<string> previousTitle {
 
 
         public override Widget buildPage(BuildContext context, Animation<float> animation, Animation<float> secondaryAnimation) {
-
-
             Widget result = builder(context);
             D.assert(() =>{
                 if (result == null) {
         }
 
         public new string debugLabel {
-            get { return $"{base.debugLabel}(${settings.name})"; }
+            get { return $"{base.debugLabel}({settings.name})"; }
         }
     }
 

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

     public interface IFixedExtentMetrics {
         int itemIndex { set; get; }
 
-        /*FixedExtentMetrics copyWith(
-            float? minScrollExtent = null,
-            float? maxScrollExtent = null,
-            float? pixels = null,
-            float? viewportDimension = null,
-            AxisDirection? axisDirection = null,
-            int? itemIndex = null
-        );*/
-        
         FixedExtentMetrics copyWith(
             float? minScrollExtent = null,
             float? maxScrollExtent = null,