aaafeaf18d
This PR adds a new `AutovalidateMode` value: `onUserInteractionIfError`. This mode allows `Form` and `FormField` widgets to auto-validate **only when a field already has an error and the user interacts with it again**. ### Why - Current modes (`disabled`, `always`, `onUserInteraction`, `onUnfocus`) do not cover the case where developers want validation **only when correcting an error**. - This improves UX by reducing unnecessary validation calls while still ensuring errors disappear as soon as the user fixes them. ### How - Added `onUserInteractionIfError` to `AutovalidateMode`. - Updated Dartdoc with detailed description and example snippet. - Added new unit tests to validate behavior. - Verified no regressions in other modes (`always`, `onUnfocus`, `onUserInteraction`). ### Example ```dart TextFormField( autovalidateMode: AutovalidateMode.onUserInteractionIfError, validator: (value) => value!.isEmpty ? 'Required field' : null, ) ```` --- ## Related Issues Fixes #\<INSERT\_RELATED\_ISSUE\_NUMBER\_IF\_ANY> --- ## Tests * Added widget tests to confirm that: * No validation occurs until a field has an error. * Once an error exists, validation runs automatically on user interaction. * Resetting the form clears errors correctly. * Regression tests ensure that `always`, `onUserInteraction`, and `onUnfocus` modes still behave correctly. --- ## Pre-launch / Reviewer Checklist * [x] I have read the [[Contributor Guide](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md)](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md) * [x] I have read the \[Tree Hygiene] wiki page and followed its guidance * [x] I have read and followed the \[Flutter Style Guide] * [x] I signed the \[CLA] * [x] I added a new enum value with clear Dartdoc (`onUserInteractionIfError`) * [x] I added example code in the Dartdoc * [x] I added new widget/unit tests for the new mode * [x] All existing and new tests pass * [x] I ran `flutter analyze` and fixed all issues * [x] No breaking changes introduced (or marked accordingly) --- ## Breaking Change * [x] Yes * [x] No --- ## Screenshots / Demo (if applicable) *(N/A — logic-only change)* --- ## Reviewer Notes * The new mode reduces unnecessary validation until the user corrects an error. * All tests confirm correct behavior and no regressions in existing modes. --------- Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>
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