Profile edit form: losing changes when submitting a modal

Please wait #3538440: Merge island_settings & island_configuration in profiles is merged before starting this one

We are closing alpha4 soon

Have the configuration use Drupal ajax when saved

Is it something which will fix this bug?

1. I uncheck a checked island (or similar changes)
2. I open the dialog of another island config
3. I save the form inside the dialog, the dialog closes
4. ❌ The island is checked again

Beta4 has already been released.

I am still reproducing this in the Profile configuration:

1. I uncheck a checked island (or similar changes)
2. I open the dialog of another island config
3. I save the form inside the dialog, the dialog closes
4. ❌ The island is checked again

Is it what you meant with "Have the configuration use Drupal ajax when saved"? If yes, we can update the description to focus on this task.

Fixed by wiring #ajax callback on the submit action when the form is opened in a modal. The form now closes via AJAX instead of redirecting, which preserves unsaved changes in the parent ProfileForm.

Without the callback, the browser submits a regular full-page POST that Drupal doesn't recognize as AJAX, so the redirect proceeds and loses the parent form's state. With it, the browser submits via XHR, the entity is saved through the normal chain, and ajaxSubmit() returns a CloseDialogCommand to close the modal without navigation.

Added a FunctionalJavascript test verifying that the modal closes without page reload and parent form changes survive. The test fails as expected if the fix is reverted.