This reverts commit c956121a.

This reverts commit 999356b7.

* Remove single-view assumption from ScrollPhysics

* fix scrollable_dispose_test.dart

* add deprecated method back

* Fix scroll jump when NestedScrollPosition is inertia-cancelled.

* Switch to using pointerScroll(0)

Adds support for Mac/iOS's behavior of scrolling (but not moving the cursor) when using page up/down in a text field.

* Support keyboard selection in selectable region

* fix some comments

* addressing comments

* Use `curly_braces_in_flow_control_structures` for `widgets`

* fix comments

* fix comments

* Support global selection

* addressing comments

* add new test

* Addressing review comments

* update

* addressing comments

* addressing comments

* Addressing comments

* fix build

* fix deprecated_new_in_comment_reference for `material` library

in a future version of the SDK, these will be flagged, fix them now

* Update pubspec.yaml

Co-authored-by: Zachary Anderson <zanderso@users.noreply.github.com>

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.