[go_router] Fixes a bug in `debugLogDiagnostics` to support StatefulShellRoute (#4177)

PR fixes the following issue:
- https://github.com/flutter/flutter/issues/127957
diff --git a/packages/go_router/CHANGELOG.md b/packages/go_router/CHANGELOG.md
index 173973a..28e8c8d 100644
--- a/packages/go_router/CHANGELOG.md
+++ b/packages/go_router/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 8.0.2 
+
+- Fixes a bug in `debugLogDiagnostics` to support StatefulShellRoute.
+
 ## 8.0.1
 
 - Fixes a link for an example in `path` documentation.
diff --git a/packages/go_router/lib/src/configuration.dart b/packages/go_router/lib/src/configuration.dart
index f2e9d84..bd10649 100644
--- a/packages/go_router/lib/src/configuration.dart
+++ b/packages/go_router/lib/src/configuration.dart
@@ -552,7 +552,7 @@
         final String fullPath = concatenatePaths(parentFullpath, route.path);
         sb.writeln('  => ${''.padLeft(depth * 2)}$fullPath');
         _debugFullPathsFor(route.routes, fullPath, depth + 1, sb);
-      } else if (route is ShellRoute) {
+      } else if (route is ShellRouteBase) {
         _debugFullPathsFor(route.routes, parentFullpath, depth, sb);
       }
     }
diff --git a/packages/go_router/pubspec.yaml b/packages/go_router/pubspec.yaml
index 2d152da..f5cd923 100644
--- a/packages/go_router/pubspec.yaml
+++ b/packages/go_router/pubspec.yaml
@@ -1,7 +1,7 @@
 name: go_router
 description: A declarative router for Flutter based on Navigation 2 supporting
   deep linking, data-driven routes and more
-version: 8.0.1
+version: 8.0.2
 repository: https://github.com/flutter/packages/tree/main/packages/go_router
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router%22
 
diff --git a/packages/go_router/test/configuration_test.dart b/packages/go_router/test/configuration_test.dart
index ac6ff0e..ac4d1ed 100644
--- a/packages/go_router/test/configuration_test.dart
+++ b/packages/go_router/test/configuration_test.dart
@@ -1037,6 +1037,33 @@
                   ),
                 ],
               ),
+              GoRoute(
+                path: '/g',
+                builder: _mockScreenBuilder,
+                routes: <RouteBase>[
+                  StatefulShellRoute.indexedStack(
+                    builder: _mockIndexedStackShellBuilder,
+                    branches: <StatefulShellBranch>[
+                      StatefulShellBranch(
+                        routes: <RouteBase>[
+                          GoRoute(
+                            path: 'h',
+                            builder: _mockScreenBuilder,
+                          ),
+                        ],
+                      ),
+                      StatefulShellBranch(
+                        routes: <RouteBase>[
+                          GoRoute(
+                            path: 'i',
+                            builder: _mockScreenBuilder,
+                          ),
+                        ],
+                      ),
+                    ],
+                  ),
+                ],
+              ),
             ],
             redirectLimit: 10,
             topRedirect: (BuildContext context, GoRouterState state) {
@@ -1049,7 +1076,10 @@
           '  =>   /a/c\n'
           '  => /d\n'
           '  =>   /d/e\n'
-          '  =>     /d/e/f\n',
+          '  =>     /d/e/f\n'
+          '  => /g\n'
+          '  =>   /g/h\n'
+          '  =>   /g/i\n',
         );
       },
     );
@@ -1069,3 +1099,7 @@
 Widget _mockShellBuilder(
         BuildContext context, GoRouterState state, Widget child) =>
     child;
+
+Widget _mockIndexedStackShellBuilder(BuildContext context, GoRouterState state,
+        StatefulNavigationShell shell) =>
+    shell;