Fix InputDecoration does not apply errorStyle to error #174787

bleroux · 2025-09-01T09:33:32Z

Description

This PR fixes InpuDecorator not applying InputDecoration.errorStyle to InputDecoration.error.

Before

Text from InputDecoration.error is not styled correctly:

After

Text from InputDecoration.error is styled correctly:

Related Issue

Fixes InputDecorator does not apply errorStyle to error

Tests

Adds 1 test.

gemini-code-assist

Code Review

This pull request correctly fixes an issue where InputDecoration.errorStyle was not applied to the InputDecoration.error widget. The implementation is sound and a regression test has been added to verify the fix. My feedback includes a suggestion to enhance the test coverage by adding a test case for custom errorStyle to ensure all scenarios are covered.

packages/flutter/test/material/input_decorator_test.dart

bleroux · 2025-09-04T14:15:38Z

@justinmc If you get a chance to review this PR, it would be great if it can get merged before or not long after #174831 (which relies on this fix to get a proper visual rendering).

ValentinVignal

LGTM

ValentinVignal · 2025-09-05T15:26:45Z

packages/flutter/test/material/input_decorator_test.dart

+          buildInputDecorator(decoration: const InputDecoration(error: Text(errorText))),
+        );
+
+        expect(findError(), findsOneWidget);


Reading the documentation of findsOneWidget, it is written that

This is equivalent to the preferred [findsOne] method.

Should we be using findsOne instead of findsOneWidget?

Should we be using findsOne instead of findsOneWidget?

Interesting question!
Searching through the codebase:

findsOne: 8218

findsOneWidget: 7610

In input_decorator_test.dart file, there are no occurences of findsOne, only findsOneWidget.
The reason is probably because findsOne was introduced somewhat recently, see #127137.
I would say using findsOneWidget when we are looking for a Widget is ok, but maybe @justinmc has some thinking about this.

I did some major archaeology here and my conclusion is that we should actually be using findsOne and not findsOneWidget! See these two comment threads:

Adds SemanticsNode Finders for searching the semantics tree #127137 (comment)

Adds SemanticsNode Finders for searching the semantics tree #127137 (comment)

It seems like there was a long-term plan to deprecate findsOneWidget, but the people involved are no longer working on Flutter.

So I guess strictly this PR should be changed to use findsOne. And I should stop using findsOneWidget like I have been for all my time on Flutter.

But in reality, both are equivalent and it doesn't really matter. I'll just keep this fact in my head in case anyone ever comes along with the motivation to clean up these duplicate methods and do the deprecation.

I see, thank you for those insights @justinmc. Is there something blocking us from deprecated findsOneWidget and other similar finders today?

If not, I could open PRs to deprecate them and migrate to findsOne and similar finders

justinmc

LGTM 👍. Sorry for the delay on this! Treat my comment below as a total nit.

justinmc · 2025-09-17T21:58:08Z

packages/flutter/test/material/input_decorator_test.dart

+          buildInputDecorator(decoration: const InputDecoration(error: Text(errorText))),
+        );
+
+        expect(findError(), findsOneWidget);


I did some major archaeology here and my conclusion is that we should actually be using findsOne and not findsOneWidget! See these two comment threads:

Adds SemanticsNode Finders for searching the semantics tree #127137 (comment)

Adds SemanticsNode Finders for searching the semantics tree #127137 (comment)

It seems like there was a long-term plan to deprecate findsOneWidget, but the people involved are no longer working on Flutter.

So I guess strictly this PR should be changed to use findsOne. And I should stop using findsOneWidget like I have been for all my time on Flutter.

But in reality, both are equivalent and it doesn't really matter. I'll just keep this fact in my head in case anyone ever comes along with the motivation to clean up these duplicate methods and do the deprecation.

bleroux · 2025-09-18T06:37:14Z

LGTM 👍. Sorry for the delay on this! Treat my comment below as a total nit.

Thanks for the review 🙏
I will let the findsOneWidget for the moment as it would be better to replace all occurrences in this test file at once.

…tter/flutter#174787)

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(flutter/flutter#175452) 2025-09-17 [email protected] CupertinoContextMenu child respects available screen width (flutter/flutter#175300) 2025-09-17 [email protected] Correct documentation in PredictiveBackFullscreenPageTransitionsBuilder (flutter/flutter#174362) ...

## Description This PR fixes `InpuDecorator` not applying `InputDecoration.errorStyle` to `InputDecoration.error`. ## Before Text from `InputDecoration.error` is not styled correctly: <img width="239" height="75" alt="image" src="https://github.com/user-attachments/assets/9b27e029-f431-4448-9d2c-9a28f52087f8" /> ## After Text from `InputDecoration.error` is styled correctly: <img width="239" height="75" alt="image" src="https://github.com/user-attachments/assets/9b0ac7da-4933-4ee8-a3ae-d7b4db7ca218" /> ## Related Issue Fixes [InputDecorator does not apply errorStyle to error](flutter#174784) ## Tests Adds 1 test.

…tter/flutter#174787)

## Description This PR fixes `InpuDecorator` not applying `InputDecoration.errorStyle` to `InputDecoration.error`. ## Before Text from `InputDecoration.error` is not styled correctly: <img width="239" height="75" alt="image" src="https://github.com/user-attachments/assets/9b27e029-f431-4448-9d2c-9a28f52087f8" /> ## After Text from `InputDecoration.error` is styled correctly: <img width="239" height="75" alt="image" src="https://github.com/user-attachments/assets/9b0ac7da-4933-4ee8-a3ae-d7b4db7ca218" /> ## Related Issue Fixes [InputDecorator does not apply errorStyle to error](flutter#174784) ## Tests Adds 1 test.

bleroux requested a review from justinmc September 1, 2025 09:33

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bleroux mentioned this pull request Sep 2, 2025

[a11y-app] Fix form field label and error message #174831

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Fix InputDecoration does not apply errorStyle to error

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bleroux force-pushed the fix_input_decoration_does_not_apply_errorStyle_to_error branch from 5281771 to 0dc7383 Compare September 17, 2025 06:10

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Merged via the queue into flutter:master with commit c0360ee Sep 18, 2025
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bleroux commented Sep 1, 2025

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