ScaffoldMessengerState constructor Null safety

1. Flutter
2. material
3. ScaffoldMessengerState
4. ScaffoldMessengerState constructor

ScaffoldMessengerState class

1. Constructors
2. ScaffoldMessengerState
3. Properties
4. context
5. hashCode
6. mounted
7. runtimeType
8. widget
9. Methods
10. activate
11. build
12. clearMaterialBanners
13. clearSnackBars
14. createTicker
15. deactivate
16. debugFillProperties
17. didChangeDependencies
18. didUpdateWidget
19. dispose
20. hideCurrentMaterialBanner
21. hideCurrentSnackBar
22. initState
23. noSuchMethod
24. reassemble
25. removeCurrentMaterialBanner
26. removeCurrentSnackBar
27. setState
28. showMaterialBanner
29. showSnackBar
30. toDiagnosticsNode
31. toString
32. toStringShort
33. Operators
34. operator ==