IconWidgetSizer constructor Null safety

1. smooth_app
2. ui_helpers
3. IconWidgetSizer
4. IconWidgetSizer constructor

IconWidgetSizer class

1. Constructors
2. IconWidgetSizer
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. getIconFlex
13. getIconSizeFromContext
14. getRemainingWidgetFlex