ListBodyParentData constructor Null safety

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

ListBodyParentData class

1. Constructors
2. ListBodyParentData
3. Properties
4. hashCode
5. nextSibling
6. offset
7. previousSibling
8. runtimeType
9. Methods
10. detach
11. noSuchMethod
12. toString
13. Operators
14. operator ==