HeroControllerScope.of

Material.of

Overlay.of

PageStorage.of

PrimaryScrollController.of

RenderAbstractViewport.of

RestorationScope.of

Scrollable.of

ScrollNotificationObserver.of

This change also introduced new static maybeOf APIs alongside the above functions,
which return a nullable version of the same value, and simply return null if the
value is not found, without throwing any exceptions.

AutofillGroup.maybeOf

DefaultTabController.maybeOf

DefaultTextHeightBehavior.maybeOf

Form.maybeOf

HeroControllerScope.maybeOf

Material.maybeOf

Overlay.maybeOf

PageStorage.maybeOf

PrimaryScrollController.maybeOf

RenderAbstractViewport.maybeOf

RestorationScope.maybeOf