fixes https://github.com/flutter/flutter/issues/126100

Reverts flutter/flutter#127039

Google3 has been fixed, so this work around is no longe necessary.

Partial revert of https://github.com/flutter/flutter/pull/126647 to work around issue in google3.

See b/283046390

Remove 1745 decorative breaks

Bump lower Dart SDK constraints to 3.0 & add class modifiers

* dart fix --apply

* manual fixes

* allow focus to leave FlutterView

* fix tests and docs

* small doc update

* fix analysis lint

* use closed loop for dialogs

* add tests for new API

* address comments

* test FocusScopeNode.traversalEdgeBehavior setter; reverse wrap-around

* rename actionResult to invokeResult

* address comments

* Implemented Scrim Focus for BottomSheet so that assistive technology users can focus and tap on the scrim to close the BottomSheet, which they could not do before the change . The Scrim Focus's size changes to avoid overlapping the BottomSheet.

* Use `curly_braces_in_flow_control_structures` for `widgets`

* fix comments

* fix comments

* Reland "Fix Backbutton is not displayed when there is a endDrawer (#102093)"

This reverts commit a4a8e73b.

* add todos

Revert "Add ability for `ModalRoutes` to ignore pointers during transitions and do so on `Cupertino` routes (#95757)" (#104520)

This reverts commit 4c0b0be2.

Add ability for `ModalRoutes` to ignore pointers during transitions and do so on `Cupertino` routes (#95757)

This reverts commit f8f43873.

* Reland "Fixes zero route transition duration crash (#90461)"

This reverts commit 403c1de5.

* Fix paged base route pop before push finishes crashes

This reverts commit 0eeb026e.