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Fixes #138916

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Comment on lines +721 to 730
if (widget.controller != oldWidget.controller) {
_tileController.removeListener(_onExpansionChanged);
if (oldWidget.controller == null) {
_tileController.dispose();
}

_tileController = widget.controller ?? ExpansibleController();
_tileController.addListener(_onExpansionChanged);
}
}
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@ValentinVignal ValentinVignal Aug 3, 2025

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What if the new controller doesn't have the same state as the previous one? For example, oldWidget.controller.isExpanded could be true while widget.controller.isExpanded is false.

What do you think is the best to do here?

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I think Expansible will handle the close and open ?

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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?

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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?

I think so. Are there any possible drawbacks to this approach?

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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?

Yes, and the underlying Expansible should have handled it if it receives a different controller.

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Sorry @chunhtai I realised I missunderstood what you were saying.

I had to update Expansible for that in Make Expansible support a new state from a new controller

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Code Review

This pull request updates ExpansionTile to handle changes to its ExpansibleController in didUpdateWidget. The changes correctly swap the controller and manage listeners. However, there's a critical issue where the visual state of the tile doesn't sync with the new controller's state, leading to UI inconsistencies. The new test case is a good start but doesn't cover the scenario where controllers with different expansion states are swapped. I've provided a more robust test case to highlight this issue and suggest a path for a complete fix.

Comment on lines +1748 to +1794
testWidgets('ExpansionTile can accept a new controller', (WidgetTester tester) async {
final ExpansibleController controller1 = ExpansibleController();
final ExpansibleController controller2 = ExpansibleController();
addTearDown(() {
controller1.dispose();
controller2.dispose();
});

await tester.pumpWidget(
MaterialApp(
home: Material(
child: ExpansionTile(
controller: controller1,
title: const Text('Title'),
initiallyExpanded: true,
children: const <Widget>[Text('Child 0')],
),
),
),
);

expect(find.text('Child 0'), findsOne);
expect(controller1.isExpanded, isTrue);
controller1.collapse();
expect(controller1.isExpanded, isFalse);
await tester.pumpAndSettle();
expect(find.text('Child 0'), findsNothing);

await tester.pumpWidget(
MaterialApp(
home: Material(
child: ExpansionTile(
controller: controller2,
title: const Text('Title'),
initiallyExpanded: true,
children: const <Widget>[Text('Child 0')],
),
),
),
);

expect(find.text('Child 0'), findsNothing);
controller2.expand();
expect(controller2.isExpanded, isTrue);
await tester.pumpAndSettle();
expect(find.text('Child 0'), findsOne);
});
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critical

This test case is a good start, but it doesn't cover the scenario where the old and new controllers have different expansion states. Currently, you collapse controller1 before switching, so both controllers are in a collapsed state, hiding a potential bug.

The implementation in didUpdateWidget correctly swaps the controller, but it doesn't synchronize the visual state of the ExpansionTile with the new controller's state. This can lead to inconsistencies. For example, if you switch from an expanded controller to a collapsed one, the tile remains visually expanded.

Here is an updated test that exposes this issue by switching from an expanded controller to a collapsed one. This test will fail with the current implementation and ensure the fix is complete.

The fix for this likely needs to be in _ExpansibleState.didUpdateWidget (in packages/flutter/lib/src/widgets/expansible.dart), where the AnimationController's value should be synchronized with the new ExpansibleController's isExpanded state.

  testWidgets('ExpansionTile can accept a new controller and syncs state', (WidgetTester tester) async {
    final ExpansibleController controller1 = ExpansibleController();
    final ExpansibleController controller2 = ExpansibleController();
    addTearDown(() {
      controller1.dispose();
      controller2.dispose();
    });

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ExpansionTile(
            controller: controller1,
            title: const Text('Title'),
            initiallyExpanded: true,
            children: const <Widget>[Text('Child 0')],
          ),
        ),
      ),
    );

    expect(find.text('Child 0'), findsOneWidget);
    expect(controller1.isExpanded, isTrue);

    // Rebuild with the new controller, which is collapsed by default.
    // The tile should now reflect the state of controller2 and be collapsed.
    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ExpansionTile(
            controller: controller2,
            title: const Text('Title'),
            initiallyExpanded: true, // This should have no effect on update.
            children: const <Widget>[Text('Child 0')],
          ),
        ),
      ),
    );

    // The tile should be collapsed to match the new controller's state.
    expect(find.text('Child 0'), findsNothing);
    expect(controller2.isExpanded, isFalse);

    // Verify that the new controller works as expected.
    controller2.expand();
    expect(controller2.isExpanded, isTrue);
    await tester.pumpAndSettle();
    expect(find.text('Child 0'), findsOneWidget);
  });

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+1 here, this test fails with the current changes in this PR.

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Yes, that is the scenario I was talking about in #173175 (comment)

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I added more tests in Add some tests :)

@victorsanni victorsanni self-requested a review August 4, 2025 17:49
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LGTM once the gemini's comment is addressed

Comment on lines +721 to 730
if (widget.controller != oldWidget.controller) {
_tileController.removeListener(_onExpansionChanged);
if (oldWidget.controller == null) {
_tileController.dispose();
}

_tileController = widget.controller ?? ExpansibleController();
_tileController.addListener(_onExpansionChanged);
}
}
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I think Expansible will handle the close and open ?

@ValentinVignal ValentinVignal force-pushed the flutter/update-expansible-controller-in-expension-tile-did-update-widget branch from 138bbf2 to ec2201f Compare August 8, 2025 16:24
@ValentinVignal ValentinVignal requested a review from chunhtai August 8, 2025 16:26
@ValentinVignal ValentinVignal force-pushed the flutter/update-expansible-controller-in-expension-tile-did-update-widget branch from ec2201f to 994250a Compare August 9, 2025 05:25
@ValentinVignal ValentinVignal added the autosubmit Merge PR when tree becomes green via auto submit App label Aug 9, 2025
@auto-submit auto-submit bot added this pull request to the merge queue Aug 11, 2025
Merged via the queue into flutter:master with commit 705c3d6 Aug 11, 2025
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@flutter-dashboard flutter-dashboard bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Aug 11, 2025
SydneyBao pushed a commit to SydneyBao/flutter that referenced this pull request Aug 11, 2025
…lutter#173175)

Fixes flutter#138916

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ksokolovskyi pushed a commit to ksokolovskyi/flutter that referenced this pull request Aug 19, 2025
…lutter#173175)

Fixes flutter#138916

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mboetger pushed a commit to mboetger/flutter that referenced this pull request Sep 18, 2025
…lutter#173175)

Fixes flutter#138916

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korca0220 pushed a commit to korca0220/flutter that referenced this pull request Sep 22, 2025
…lutter#173175)

Fixes flutter#138916

## Pre-launch Checklist

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[Discord]:
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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Nov 12, 2025
lucaantonelli pushed a commit to lucaantonelli/flutter that referenced this pull request Nov 21, 2025
…lutter#173175)

Fixes flutter#138916

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
Assist for
GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).
Comments from the `gemini-code-assist` bot should not be taken as
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useful you can update your code accordingly, but if you are unsure or
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https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
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[Flutter Style Guide]:
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[Features we expect every widget to implement]:
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https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
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ExpansionTileController is not updated in didUpdateWidget

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