Themes: Add filter on bulk action fields.

Because validation was added in [59134] to prevent submitting bulk actions with no selected action, sites that remove or change the default bulk actions can fail due to the missing required inputs. Add a filter (`bulk_action_observer_ids`) that allows modifying the actions accepted to fulfill validation rules.

Props ethitter, kabir93, jorbin, davidbaumwald, joedolson.
Fixes #63005.

git-svn-id: https://develop.svn.wordpress.org/trunk@60186 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/js/_enqueues/admin/common.js

@@ -1327,8 +1327,8 @@ $( function() {
 
 		// Observe submissions from posts lists for 'bulk_action' or users lists for 'new_role'.
 		var bulkFieldRelations = {
-			'bulk_action' : 'action',
-			'changeit' : 'new_role'
+			'bulk_action' : window.bulkActionObserverIds.bulk_action,
+			'changeit' : window.bulkActionObserverIds.changeit
 		};
 		if ( ! Object.keys( bulkFieldRelations ).includes( submitterName ) ) {
 			return;

src/wp-includes/script-loader.php

@@ -757,6 +757,28 @@ function wp_default_scripts( $scripts ) {
 	$scripts->add( 'common', "/wp-admin/js/common$suffix.js", array( 'jquery', 'hoverIntent', 'utils', 'wp-a11y' ), false, 1 );
 	$scripts->set_translations( 'common' );
 
+	$bulk_action_observer_ids = array(
+		'bulk_action' => 'action',
+		'changeit'    => 'new_role',
+	);
+	did_action( 'init' ) && $scripts->localize(
+		'common',
+		'bulkActionObserverIds',
+		/**
+		 * Filters the array of field name attributes for bulk actions.
+		 *
+		 * @since 6.8.1
+		 *
+		 * @param array $bulk_action_observer_ids {
+		 *      An array of field name attributes for bulk actions.
+		 *
+		 *      @type string $bulk_action The bulk action field name. Default 'action'.
+		 *      @type string $changeit    The new role field name. Default 'new_role'.
+		 * }
+		 */
+		apply_filters( 'bulk_action_observer_ids', $bulk_action_observer_ids )
+	);
+
 	$scripts->add( 'wp-sanitize', "/wp-includes/js/wp-sanitize$suffix.js", array(), false, 1 );
 
 	$scripts->add( 'sack', "/wp-includes/js/tw-sack$suffix.js", array(), '1.6.1', 1 );