The upcoming linter release notices null literals as unnecessary argument values and flags more `type_literal_in_constant_pattern` cases. 

See breakages: https://logs.chromium.org/logs/dart/buildbucket/cr-buildbucket/8780744067138629361/+/u/analyze_flutter_flutter/stdout

Close https://github.com/flutter/flutter/issues/125600

Most of these imports were never appropriate. The `test_api` package was never intended for use in `_test.dart` files.
Where possible move imports to `matcher`, otherwise move them to `test` or `flutter_test`.

Leave uses of `test_api` from `flutter_test` library code.

`SemanticsFlag`/`SemanticsAction` cleanup (part 4)

* Introduce tests for tristate checkboxes

* Initial

* Use tristate changes in engine

* Flutter_test matchers test update

* Comments, tests

* Update packages/flutter/lib/src/semantics/semantics.dart
Co-authored-by: Chris Bracken <chris@bracken.jp>

* Assert mutual exclusivity

* Assert valid state before updating state

* Update packages/flutter/lib/src/semantics/semantics.dart

Typo fix in comment
Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>
Co-authored-by: Chris Bracken <chris@bracken.jp>
Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_driver`

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_goldens`

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_goldens_client`

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_localizations`

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_test`

* Use `curly_braces_in_flow_control_structures` for `packages/flutter_web_plugins`

* fix comments

* Use `curly_braces_in_flow_control_structures` for `packages/integration_test`

* fix indentation

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.

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

* Adds a semantics node flag to identify sliders.

* [fuchsia] Fix roll of engine PR #25167

This changes fixes tests failing due to new isKeyboardKey semantics
flag.

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