[go_router] Fix relative navigation after imperative navigation

packages/go_router/lib/src/router.dart

@@ -17,6 +17,7 @@ import 'misc/constants.dart';
 import 'misc/inherited_router.dart';
 import 'on_enter.dart';
 import 'parser.dart';
+import 'path_utils.dart';
 import 'route.dart';
 import 'state.dart';
 
@@ -402,11 +403,24 @@ class GoRouter implements RouterConfig<RouteMatchList> {
     fragment: fragment,
   );
 
+  String _resolveRelativeLocation(String location) {
+    if (!location.startsWith('./')) {
+      return location;
+    }
+
+    final RouteMatch? lastMatch = routerDelegate.currentConfiguration.lastOrNull;
+    if (lastMatch is! ImperativeRouteMatch) {
+      return location;
+    }
+
+    return concatenateUris(lastMatch.matches.uri, Uri.parse(location)).toString();
+  }
+
   /// Navigate to a URI location w/ optional query parameters, e.g.
   /// `/family/f2/person/p1?color=blue`
   void go(String location, {Object? extra}) {
     log('going to $location');
-    routeInformationProvider.go(location, extra: extra);
+    routeInformationProvider.go(_resolveRelativeLocation(location), extra: extra);
   }
 
   /// Restore the RouteMatchList
@@ -448,7 +462,7 @@ class GoRouter implements RouterConfig<RouteMatchList> {
   Future<T?> push<T extends Object?>(String location, {Object? extra}) async {
     log('pushing $location');
     return routeInformationProvider.push<T>(
-      location,
+      _resolveRelativeLocation(location),
       base: routerDelegate.currentConfiguration,
       extra: extra,
     );
@@ -478,7 +492,7 @@ class GoRouter implements RouterConfig<RouteMatchList> {
   Future<T?> pushReplacement<T extends Object?>(String location, {Object? extra}) {
     log('pushReplacement $location');
     return routeInformationProvider.pushReplacement<T>(
-      location,
+      _resolveRelativeLocation(location),
       base: routerDelegate.currentConfiguration,
       extra: extra,
     );
@@ -516,7 +530,7 @@ class GoRouter implements RouterConfig<RouteMatchList> {
   Future<T?> replace<T>(String location, {Object? extra}) {
     log('replace $location');
     return routeInformationProvider.replace<T>(
-      location,
+      _resolveRelativeLocation(location),
       base: routerDelegate.currentConfiguration,
       extra: extra,
     );

packages/go_router/pending_changelogs/change_2026_08_12_1786487000886.yaml

@@ -0,0 +1,3 @@
+changelog: |
+  - Fixes relative navigation resolving against the underlying route instead of the imperatively-pushed route.
+version: patch

packages/go_router/test/imperative_api_test.dart

@@ -286,4 +286,57 @@ void main() {
     expect(find.text('shell'), findsNothing);
     expect(find.byKey(e), findsOneWidget);
   });
+
+  for (final MapEntry<String, void Function(GoRouter, String)> operation
+      in <String, void Function(GoRouter, String)>{
+        'go': (GoRouter router, String location) => router.go(location),
+        'push': (GoRouter router, String location) => router.push<void>(location),
+        'pushReplacement': (GoRouter router, String location) =>
+            router.pushReplacement<void>(location),
+        'replace': (GoRouter router, String location) => router.replace<void>(location),
+      }.entries) {
+    testWidgets('${operation.key} resolves a relative route against the imperative top', (
+      WidgetTester tester,
+    ) async {
+      // Regression test for https://github.com/flutter/flutter/issues/182441.
+      final homeReviews = UniqueKey();
+      final productReviews = UniqueKey();
+      final routes = <RouteBase>[
+        GoRoute(
+          path: '/home',
+          builder: (_, _) => const DummyScreen(),
+          routes: <RouteBase>[
+            GoRoute(
+              path: 'reviews',
+              builder: (_, _) => DummyScreen(key: homeReviews),
+            ),
+          ],
+        ),
+        GoRoute(
+          path: '/products/:id',
+          builder: (_, _) => const DummyScreen(),
+          routes: <RouteBase>[
+            GoRoute(
+              path: 'reviews',
+              builder: (_, _) => DummyScreen(key: productReviews),
+            ),
+          ],
+        ),
+      ];
+      final GoRouter router = await createRouter(routes, tester, initialLocation: '/home');
+
+      router.push<void>('/products/9');
+      await tester.pumpAndSettle();
+      expect(router.state.uri.path, '/products/9');
+
+      operation.value(router, './reviews?sort=recent#top');
+      await tester.pumpAndSettle();
+
+      expect(router.state.uri.path, '/products/9/reviews');
+      expect(router.state.uri.queryParameters, <String, String>{'sort': 'recent'});
+      expect(router.state.uri.fragment, 'top');
+      expect(find.byKey(productReviews), findsOneWidget);
+      expect(find.byKey(homeReviews), findsNothing);
+    });
+  }
 }