[go_router] context.canPop() always returning false inside StatefulShellRoute builder when branch has pushed pages

### What package does this bug report belong to?

go_router

### What target platforms are you seeing this bug on?

iOS

### Have you already upgraded your packages?

Yes

### Dependency versions

<details><summary>pubspec.lock</summary>

```lock
# Generated by pub
# See https://dart.dev/tools/pub/glossary#lockfile
packages:
  async:
    dependency: transitive
    description:
      name: async
      sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63
      url: "https://pub.dev"
    source: hosted
    version: "2.12.0"
  boolean_selector:
    dependency: transitive
    description:
      name: boolean_selector
      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.2"
  characters:
    dependency: transitive
    description:
      name: characters
      sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
      url: "https://pub.dev"
    source: hosted
    version: "1.4.0"
  clock:
    dependency: transitive
    description:
      name: clock
      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
      url: "https://pub.dev"
    source: hosted
    version: "1.1.2"
  collection:
    dependency: transitive
    description:
      name: collection
      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
      url: "https://pub.dev"
    source: hosted
    version: "1.19.1"
  cupertino_icons:
    dependency: "direct main"
    description:
      name: cupertino_icons
      sha256: ba631d1c7f7bef6b729a622b7b752645a2d076dba9976925b8f25725a30e1ee6
      url: "https://pub.dev"
    source: hosted
    version: "1.0.8"
  fake_async:
    dependency: transitive
    description:
      name: fake_async
      sha256: "6a95e56b2449df2273fd8c45a662d6947ce1ebb7aafe80e550a3f68297f3cacc"
      url: "https://pub.dev"
    source: hosted
    version: "1.3.2"
  flutter:
    dependency: "direct main"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_lints:
    dependency: "direct dev"
    description:
      name: flutter_lints
      sha256: "5398f14efa795ffb7a33e9b6a08798b26a180edac4ad7db3f231e40f82ce11e1"
      url: "https://pub.dev"
    source: hosted
    version: "5.0.0"
  flutter_test:
    dependency: "direct dev"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_web_plugins:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  go_router:
    dependency: "direct main"
    description:
      name: go_router
      sha256: f02fd7d2a4dc512fec615529824fdd217fecb3a3d3de68360293a551f21634b3
      url: "https://pub.dev"
    source: hosted
    version: "14.8.1"
  leak_tracker:
    dependency: transitive
    description:
      name: leak_tracker
      sha256: c35baad643ba394b40aac41080300150a4f08fd0fd6a10378f8f7c6bc161acec
      url: "https://pub.dev"
    source: hosted
    version: "10.0.8"
  leak_tracker_flutter_testing:
    dependency: transitive
    description:
      name: leak_tracker_flutter_testing
      sha256: f8b613e7e6a13ec79cfdc0e97638fddb3ab848452eff057653abd3edba760573
      url: "https://pub.dev"
    source: hosted
    version: "3.0.9"
  leak_tracker_testing:
    dependency: transitive
    description:
      name: leak_tracker_testing
      sha256: "6ba465d5d76e67ddf503e1161d1f4a6bc42306f9d66ca1e8f079a47290fb06d3"
      url: "https://pub.dev"
    source: hosted
    version: "3.0.1"
  lints:
    dependency: transitive
    description:
      name: lints
      sha256: c35bb79562d980e9a453fc715854e1ed39e24e7d0297a880ef54e17f9874a9d7
      url: "https://pub.dev"
    source: hosted
    version: "5.1.1"
  logging:
    dependency: transitive
    description:
      name: logging
      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
      url: "https://pub.dev"
    source: hosted
    version: "1.3.0"
  matcher:
    dependency: transitive
    description:
      name: matcher
      sha256: dc58c723c3c24bf8d3e2d3ad3f2f9d7bd9cf43ec6feaa64181775e60190153f2
      url: "https://pub.dev"
    source: hosted
    version: "0.12.17"
  material_color_utilities:
    dependency: transitive
    description:
      name: material_color_utilities
      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
      url: "https://pub.dev"
    source: hosted
    version: "0.11.1"
  meta:
    dependency: transitive
    description:
      name: meta
      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
      url: "https://pub.dev"
    source: hosted
    version: "1.16.0"
  path:
    dependency: transitive
    description:
      name: path
      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
      url: "https://pub.dev"
    source: hosted
    version: "1.9.1"
  sky_engine:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  source_span:
    dependency: transitive
    description:
      name: source_span
      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
      url: "https://pub.dev"
    source: hosted
    version: "1.10.1"
  stack_trace:
    dependency: transitive
    description:
      name: stack_trace
      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
      url: "https://pub.dev"
    source: hosted
    version: "1.12.1"
  stream_channel:
    dependency: transitive
    description:
      name: stream_channel
      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.4"
  string_scanner:
    dependency: transitive
    description:
      name: string_scanner
      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
      url: "https://pub.dev"
    source: hosted
    version: "1.4.1"
  term_glyph:
    dependency: transitive
    description:
      name: term_glyph
      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
      url: "https://pub.dev"
    source: hosted
    version: "1.2.2"
  test_api:
    dependency: transitive
    description:
      name: test_api
      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
      url: "https://pub.dev"
    source: hosted
    version: "0.7.4"
  vector_math:
    dependency: transitive
    description:
      name: vector_math
      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
      url: "https://pub.dev"
    source: hosted
    version: "2.1.4"
  vm_service:
    dependency: transitive
    description:
      name: vm_service
      sha256: "0968250880a6c5fe7edc067ed0a13d4bae1577fe2771dcf3010d52c4a9d3ca14"
      url: "https://pub.dev"
    source: hosted
    version: "14.3.1"
sdks:
  dart: ">=3.7.2 <4.0.0"
  flutter: ">=3.22.0"

```

</details>


### Steps to reproduce

1. Create a `StatefulShellRoute.IndexedStack` which has two main routes/screen (its branches, `screenA` and `screenB`)
2. Navigate inside one of the branches to `screenADetail` (using `context.push`)
3. A BackButton is declared in the StatefulShellRoute builder (which holds the base Scaffold for the shell), it should be rendered when `context.canPop()` returns true
4. Cannot go back with BackButton (`context.canPop()` is always false)

### Expected results

On step 4, `context.canPop()` returns true because there was a page pushed inside the branch of ScreenA

### Actual results

On step 4, `context.canPop()` returns false and not rendering the BackButton

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
      ),
      routerConfig: router,
    );
  }
}

final router = GoRouter(
  initialLocation: '/a',
  routes: [
    StatefulShellRoute.indexedStack(
      builder: (context, state, navigationShell) {
        return Scaffold(
          appBar: AppBar(
            title: const Text('GoRouter'),
            leading:
                navigationShell.shellRouteContext.navigatorKey.currentContext
                            ?.canPop() ??
                        false
                    ? BackButton()
                    : Icon(Icons.question_mark_rounded),
          ),
          body: navigationShell,
          bottomNavigationBar: BottomNavigationBar(
            items: const [
              BottomNavigationBarItem(icon: Icon(Icons.home), label: 'A'),
              BottomNavigationBarItem(icon: Icon(Icons.settings), label: 'B'),
            ],
            currentIndex: navigationShell.currentIndex,
            onTap: (index) {
              navigationShell.goBranch(index);
            },
          ),
        );
      },
      branches: [
        StatefulShellBranch(
          routes: [
            GoRoute(
              path: '/a',
              builder: (context, state) => const ScreenA(),
              routes: [
                GoRoute(
                  path: 'detail',
                  builder: (context, state) => const ScreenADetail(),
                ),
              ],
            ),
          ],
        ),
        StatefulShellBranch(
          routes: [
            GoRoute(path: '/b', builder: (context, state) => const ScreenB()),
          ],
        ),
      ],
    ),
  ],
);

class ScreenA extends StatelessWidget {
  const ScreenA({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Center(child: Text('Screen A')),
          const SizedBox(height: 20),
          ElevatedButton(
            onPressed: () {
              context.push('/a/detail');
            },
            child: const Text('Go to detail'),
          ),
        ],
      ),
    );
  }
}

class ScreenB extends StatelessWidget {
  const ScreenB({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(child: Text('Screen B'));
  }
}

class ScreenADetail extends StatelessWidget {
  const ScreenADetail({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(child: Text('Screen A Detail'));
  }
}

```

</details>


### Screenshots or Videos

<details open>
<summary>Screenshots / Video demonstration</summary>

[Upload media here]

</details>


### Logs

<details open><summary>Logs</summary>

```console
[Paste your logs here]
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.3, on macOS 14.4.1 23E224
    darwin-arm64, locale es-419)
[✓] Android toolchain - develop for Android devices (Android SDK
    version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] VS Code (version 1.101.1)
[✓] Connected device (5 available)
[✓] Network resources

• No issues found!
```

</details>


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[go_router] context.canPop() always returning false inside StatefulShellRoute builder when branch has pushed pages #171451

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[go_router] context.canPop() always returning false inside StatefulShellRoute builder when branch has pushed pages #171451

Description

What package does this bug report belong to?

What target platforms are you seeing this bug on?

Have you already upgraded your packages?

Dependency versions

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Videos

Logs

Flutter Doctor output

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

pFad - (p)hone/(F)rame/(a)nonymizer/(d)eclutterfier! Saves Data!