[material_ui][cupertino_ui] allow page routes to opt out of route semantics - #182556 (#12674) Nested navigators may use routes to update only part of the visible screen. However, Material and Cupertino page routes currently introduce a semantics route scope, causing screen readers to treat these updates as navigation to a new screen. This adds `includeRouteSemantics` to: - `MaterialPageRoute` - `MaterialPage` - `CupertinoPageRoute` - `CupertinoPage` The option defaults to `true`, preserving existing behavior. When set to `false`, the route content is not wrapped in a semantics node with `scopesRoute: true`. Tests cover both imperative routes and declarative pages. Fixes flutter/flutter#168915. ## Pre-Review Checklist [^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.
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