MaterialInkController constructor Null safety

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

MaterialInkController class

1. Constructors
2. MaterialInkController
3. Properties
4. color
5. hashCode
6. runtimeType
7. vsync
8. Methods
9. addInkFeature
10. markNeedsPaint
11. noSuchMethod
12. toString
13. Operators
14. operator ==