flutter_flutter

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Shared element transition for predictive back (#154718 )

This PR adds a shared element transition for predictive back navigation,
based on the specification found here:
https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition.

A new transition builder added:
`PredictiveBackPageSharedElementTransitionsBuilder`, which constructs
the shared element transition version.

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

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        brightness: Brightness.light,
        pageTransitionsTheme: const PageTransitionsTheme(
          builders: {
            TargetPlatform.android: PredictiveBackPageSharedElementTransitionsBuilder(),
          },
        ),
      ),
      home: const FirstScreen(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('First Screen'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.of(context).push(
              MaterialPageRoute(builder: (_) => const SecondScreen()),
            );
          },
          child: const Text('Go to Second Screen'),
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: ThemeData(brightness: Brightness.dark),
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Second Screen'),
        ),
        body: const Center(
          child: Text('Hello, Predictive back!'),
        ),
      ),
    );
  }
}
```

</details>


[predictive_back_shared_element.webm](https://github.com/user-attachments/assets/1194cf09-c64f-4b1f-aa3f-10feb0ef12bd)

Partial fix for #153577

---------

Co-authored-by: Justin McCandless <jmccandless@google.com>

2025-05-19 22:06:58 +00:00

flutter

Shared element transition for predictive back (#154718 )

2025-05-19 22:06:58 +00:00

flutter_driver

Roll pub packages (#168509 )

2025-05-08 00:50:25 +00:00

flutter_goldens

Increase pinned version of leak tracker to enable access to experimental tracking on web. (#167502 )

2025-04-21 23:48:15 +00:00

flutter_localizations

Update date localizations for ga (#168008 )