<?php 
/** 
 * Adds the wp-block-list class to the rendered list block. 
 * 
 * @package WordPress 
 */ 
 
/** 
 * Adds the wp-block-list class to the rendered list block. 
 * Ensures that pre-existing list blocks use the class name on the front. 
 * For example, <ol> is transformed to <ol class="wp-block-list">. 
 * 
 * @since 6.6.0 
 * 
 * @see https://github.com/WordPress/gutenberg/issues/12420 
 * 
 * @param array  $attributes Attributes of the block being rendered. 
 * @param string $content Content of the block being rendered. 
 * 
 * @return string The content of the block being rendered. 
 */ 
function block_core_list_render( $attributes, $content ) { 
    if ( ! $content ) { 
        return $content; 
    } 
 
    $processor = new WP_HTML_Tag_Processor( $content ); 
 
    $list_tags = array( 'OL', 'UL' ); 
    while ( $processor->next_tag() ) { 
        if ( in_array( $processor->get_tag(), $list_tags, true ) ) { 
            $processor->add_class( 'wp-block-list' ); 
            break; 
        } 
    } 
 
    return $processor->get_updated_html(); 
} 
 
/** 
 * Registers the `core/list` block on server. 
 * 
 * @since 6.6.0 
 */ 
function register_block_core_list() { 
    register_block_type_from_metadata( 
        __DIR__ . '/list', 
        array( 
            'render_callback' => 'block_core_list_render', 
        ) 
    ); 
} 
 
add_action( 'init', 'register_block_core_list' ); 
 
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