[go_router] Resolve relative ./ navigation against the imperative top (flutter#182441)

[NadeemIqbal]

Fixes flutter/flutter#182441.

Description

After router.push('/products'), Flutter's Router calls GoRouteInformationProvider.routerReportsNewRouteInformation with the URI returned by restoreRouteInformation. When GoRouter.optionURLReflectsImperativeAPIs is false (the default), that URI excludes any ImperativeRouteMatches, so the provider's _value.uri is reset from /products back to the non-imperative base /home. The next push('./reviews') then resolves the relative path against that stale _value.uri inside _setValue, sending the user to /home/reviews instead of /products/reviews.

The user-facing symptom of this in go_router_builder (#182441) is that a TypedRelativeGoRoute child shared by multiple parents always resolves to the first parent in the route tree: the generated pushRelative calls context.push('./<child>'), which the provider misresolves.

Verifying the diagnosis

Reproduced at the GoRouter runtime layer (no go_router_builder required):

final router = GoRouter(initialLocation: '/home', routes: <RouteBase>[
  GoRoute(path: '/home',     routes: [GoRoute(path: 'reviews', ...)], ...),
  GoRoute(path: '/products', routes: [GoRoute(path: 'reviews', ...)], ...),
]);
router.push('/products');     // router.state.uri.path == '/products'  ✓
router.push('./reviews');     // expected: /products/reviews
                              // actual on main:  /home/reviews        ✗

Instrumenting _setValue shows _value.uri flipping from /products (set by step 1) back to /home (set by Flutter's routerReportsNewRouteInformation callback) before step 2 runs.

Fix

Resolve ./ paths up-front in push, pushReplacement, and replace using the actual top of their base (drilling through ShellRouteMatch and using the URI of the top ImperativeRouteMatch, falling back to base.uri otherwise). The location passed to _setValue is then already absolute, sidestepping the stale _value.uri.

go is left unchanged: it does not stack and has no base, and the existing relative "./" navigation resolves against current location test in on_enter_test.dart continues to cover the go('./...') path.

Tests

• Added two regression tests in packages/go_router/test/imperative_api_test.dart mirroring the shared-parent scenario from #182441:
  1. push('./<child>') from an imperative parent.
  2. The same for pushReplacement('./<child>') and replace('./<child>').
• Full suite: 431/431 pass (was 430/430), no regressions.

Versioning

Bumped go_router 17.2.3 → 17.2.4 and added a CHANGELOG entry per pub versioning philosophy.

List which issues are fixed by this PR.

flutter/flutter#182441

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter (dart format).
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets ([go_router]).
• I linked to at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version.
• I updated CHANGELOG.md to add a description of the change.
• I added new tests to check the change I am making.
• I am willing to follow-up on review comments in a timely manner.

[gemini-code-assist]

Code Review

This pull request updates go_router to version 17.2.4 and addresses an issue where relative navigation using imperative APIs resolved against the incorrect base URI. The implementation introduces _topUriOf and _resolveRelativeAgainstBase helper methods in GoRouteInformationProvider to ensure relative paths resolve against the actual visible top route. The fix is applied to the push, pushReplacement, and replace methods, and is accompanied by new regression tests. I have no feedback to provide.

[stuartmorgan-g]

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