ToolbarItemsParentData constructor Null safety

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

ToolbarItemsParentData class

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