SliverMultiBoxAdaptorParentData constructor Null safety

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

SliverMultiBoxAdaptorParentData class

1. Constructors
2. SliverMultiBoxAdaptorParentData
3. Properties
4. hashCode
5. index
6. keepAlive
7. keptAlive
8. layoutOffset
9. nextSibling
10. previousSibling
11. runtimeType
12. Methods
13. detach
14. noSuchMethod
15. toString
16. Operators
17. operator ==