StackParentData constructor Null safety

1. Flutter
2. rendering
3. StackParentData
4. StackParentData constructor

StackParentData class

1. Constructors
2. StackParentData
3. Properties
4. bottom
5. hashCode
6. height
7. isPositioned
8. left
9. nextSibling
10. offset
11. previousSibling
12. rect
13. right
14. runtimeType
15. top
16. width
17. Methods
18. detach
19. noSuchMethod
20. toString
21. Operators
22. operator ==