fix an error about heros

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

                     List<FocusScopeNode> scopeNodes = new List<FocusScopeNode>();
                     var length = widget.tabNumber - tabFocusNodes.Count;
                     for (int i = 0; i < length; i++) {
-                        tabFocusNodes.Add(new FocusScopeNode(debugLabel: $"CupertinoTabScaffold Tab {i + tabFocusNodes.Count}")
+                        scopeNodes.Add(new FocusScopeNode(debugLabel: $"CupertinoTabScaffold Tab {i + tabFocusNodes.Count}")
+                    tabFocusNodes.AddRange(scopeNodes);
 
                 }
 

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

                 }
             }
             foreach (object tag in toHeroes.Keys) {
-                if (fromHeroes[tag] == null)
+                _HeroState heroState = new _HeroState();
+                if (!fromHeroes.TryGetValue(tag, out heroState)) {
+                }
+                
             }
         }
 

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

     public class NavigatorState : TickerProviderStateMixin<Navigator> {
         public readonly GlobalKey<OverlayState> _overlayKey = GlobalKey<OverlayState>.key();
         public List<_RouteEntry> _history = new List<_RouteEntry>();
-        public readonly FocusScopeNode focusScopeNode = new FocusScopeNode();
+        public readonly FocusScopeNode focusScopeNode = new FocusScopeNode(debugLabel: "Navigator Scope");
         public bool _debugLocked = false; // used to prevent re-entrant calls to push, pop, and friends
 
         public override void initState() {