876aa48ea5
*Use `super.key` instead of manually passing the `Key` parameter using super(key: key) in the constructors.* Since if you create a widget the new default will use `super.key` instead of `Key? key : super(key: key)` this small change is to maintain the consistency, it has no semantic change also there are some other places that might need to be updated:  this file for example generate l10n project and it has all the dart code as String, it might have tests that validate the output somewhere that I might miss, also there are some other places like the `_Segment` class where it require `ValueKey` instead if `Key` so I didn't update them (even though it's possible)