polly_media form_alter adds submit handler to every entity form's submit button, breaking forms that rely on form-level submit handlers (e.g. taxonomy term overview) (#3600850) · Issues · project / polly

polly_media form_alter adds submit handler to every entity form's submit button, breaking forms that rely on form-level submit handlers (e.g. taxonomy term overview)

>>> [!note] Migrated issue   Reported by: [hanoii](https://www.drupal.org/user/23157) Related to !9 >>> MediaWidgetAlter::formAlter() (invoked via hook_form_alter()) appends a submit handler to the submit button of every form whose form object is an EntityFormInterface: <pre>#[Hook('form_alter')] public function formAlter(array &$form, FormStateInterface $form_state, string $form_id): void {   $form_object = $form_state->getFormObject();   if (!$form_object instanceof EntityFormInterface) {     return;   }   $form['actions']['submit']['#submit'][] = [static::class, 'widgetFormSubmitCallback']; }</pre>This has two problems: 1. Too broad. It attaches to entity forms that have no synthesizable media widget at all. The handler no-ops in that case (it returns early unless polly_media_entity_to_speech is set), so it's functionally harmless on most forms — but it still mutates the form. 2. It breaks forms that don't set their own button #submit and instead rely on the form-level handler. Once a submit button defines any #submit handlers, Drupal's FormSubmitter::executeSubmitHandlers() uses only the button's handlers and ignores the form-level $form['#submit'] (which normally contains the form object's ::submitForm). So by adding a handler to the button, polly_media suppresses the form's own submit handler. My own victim was core's taxonomy term overview form (Drupal\taxonomy\Form\OverviewTerms). In Drupal 11 this form became an EntityForm (it was a FormBase in Drupal 10). It builds its own actions and does not put a #submit on the Save button — it depends entirely on the form-level ::submitForm. After polly_media appends widgetFormSubmitCallback to that button, OverviewTerms::submitForm() never runs. Result: reordering taxonomy terms silently does nothing — the form submits, redirects normally, no error, but term weights are never saved. This is a Drupal 11 regression for sites running polly_media, triggered purely by OverviewTerms changing from FormBase to EntityForm. Steps to reproduce 1. Install polly + polly_media and enable the synthesize option on at least one media reference widget. 2. Go to a vocabulary's term overview (/admin/structure/taxonomy/manage/{vid}/overview). 3. Drag to reorder terms, click Save. Expected: weights are saved, terms keep the new order. Actual: "The configuration options have been saved." does not appear, order reverts, taxonomy_term_field_data.weight stays unchanged. OverviewTerms::submitForm() is never called because only the polly callback is registered as the button's submit handler. Any custom/contrib EntityForm that builds its own actions without a button-level #submit is affected the same way. Proposed resolution Two complementary changes in MediaWidgetAlter: 1. Scope the attachment to forms that actually render a synthesizable media widget. fieldWidgetCompleteFormAlter() already determines this (third-party setting allow_synthesis, entity form, fieldable entity, permission). Set a flag there: $form_state->set('polly_media_synthesize_widget', TRUE); 1. and have formAlter() bail unless the flag is set. Because fieldWidgetCompleteFormAlter() runs while fields are built (inside the form object's buildForm()) and hook_form_alter() runs after buildForm() returns, the flag is reliably available. 2. Attach where Drupal will actually run it, without overriding existing handlers: <pre>if (!$form_state->get('polly_media_synthesize_widget')) {   return; } $callback = [static::class, 'widgetFormSubmitCallback']; if (isset($form['actions']['submit']) && isset($form['actions']['submit']['#submit'])) {   // Button has its own handlers; Drupal uses only those.   $form['actions']['submit']['#submit'][] = $callback; } else {      // No button-level handlers; the form-level handlers are used.   $form['#submit'][] = $callback; }</pre>This keeps current behaviour for normal content entity edit forms (their Save button already carries ['::submitForm', '::save'], so the callback is appended there and still runs after ::save), stops polly_media from touching unrelated forms, and never suppresses a form's own submit handler. The fix lives entirely in MediaWidgetAlter::formAlter() and ::fieldWidgetCompleteFormAlter(), which are the same methods invoked on both Drupal 10.3 (via the procedural #[LegacyHook] bridge in polly_media.module) and Drupal 11 (via the #[Hook] attribute), so a single change covers both supported core versions.

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