This reverts commit c956121a.

This reverts commit 999356b7.

* Remove single-view assumption from ScrollPhysics

* fix scrollable_dispose_test.dart

* add deprecated method back

* Bump min SDK to 2.19.0-0

* fix

* Update parameters to the `styleFrom` button methods.

* Updated the Flutter fix data to point to this PR.

* Updated handling of background color to better maintain backwards compatibility with previous API.

* more const immutable classes

* more const constructors in dev/ and examples/

See https://github.com/flutter/flutter/pull/103719

Co-authored-by: Michael Goderbauer <goderbauer@google.com>

* Added the new Material 3 colors to ColorScheme.

* Deprecated primaryVariant and secondaryVariant colors in the ColorScheme.

* Added a flutter fix for the deprecated colors.

This reverts commit 5fd259be.

This adds avoid_dynamic_calls to the list of lints, and fixes all instances where it was violated.

Importantly, this lint is NOT turned on for flutter/packages/test, because those changes are happening in another PR: #84478