* Manual roll of engine 45b66b7...ffba2f6

git log 45b66b7...ffba2f6 --oneline

ffba2f68d Roll src/third_party/dart b37aa3b036...0abff7b2bb (#9588)
62514cb77 Roll fuchsia/sdk/core/mac-amd64 from n9fZpXVmsbgKZzS8Q2GXxB453q8AbLpfGztsPsq47pMC to BYCwsJf7r7zfd2THSGinFeIHv552AEVchXdc7VZzP0IC (#9587)
9f2721284 Roll src/third_party/skia e4c88bb1f848..1ddee025229a (7 commits) (#9586)
03a31e0ad Roll fuchsia/sdk/core/linux-amd64 from F9oY0d56X3aONxwv5vw9Gco--AHmC8SHuDXdhdWCnnMC to d2VK3FYSEKQ35UdZw5FdbOZUI_xgT0-1h8DnGDUHPVAC (#9583)

* Fix analyzer warning.

This PR adds a new parameter to RawGestureDetector, `semantics`, which configures how detectors handle semantics gestures. It has a default delegate that keep the current behavior.

This reverts commit 572f349f.

- A refactor that moves the semantics declaration from detectors to recognizers to allow custom recognizers to respond to semantic gectures.
- Renames all handlers related to semantics from Gesture* to Semantics*.

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

* a11y: remove SemanticsSortOrder; sort locally only; semanticsOwner post-test check

* update accessibility test framework

- default nextNodeId/previousNodeId to -1
- stop treating null as opt-out from value testing
- add `id`, `TestSemantics.root`, and `tags` to the suggested code in the TestSemantics failure message
- fix a small bug with raw string escaping
- update all tests accordingly

* fix sortKey doc

* prefer const over final

* a11y: handle left/right scrolls correctly

* fix keep alive test

* fix scaffold test