WidgetOrderTraversalPolicy constructor Null safety

1. Flutter
2. widgets
3. WidgetOrderTraversalPolicy
4. WidgetOrderTraversalPolicy constructor

WidgetOrderTraversalPolicy class

1. Constructors
2. WidgetOrderTraversalPolicy
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. changedScope
8. debugFillProperties
9. findFirstFocus
10. findFirstFocusInDirection
11. findLastFocus
12. inDirection
13. invalidateScopeData
14. next
15. noSuchMethod
16. previous
17. sortDescendants
18. toDiagnosticsNode
19. toString
20. toStringShort
21. Operators
22. operator ==