WordPress/wp-includes/block-supports/layout.php

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<?php
/**
* Layout block support flag.
*
* @package WordPress
* @since 5.8.0
*/
/**
* For themes without theme.json file, make sure
* to restore the inner div for the group block
* to avoid breaking styles relying on that div.
*
* @since 5.8.0
* @access private
*
* @param string $block_content Rendered block content.
* @param array $block Block object.
*
* @return string Filtered block content.
*/
function wp_restore_group_inner_container( $block_content, $block ) {
$group_with_inner_container_regex = '/(^\s*<div\b[^>]*wp-block-group(\s|")[^>]*>)(\s*<div\b[^>]*wp-block-group__inner-container(\s|")[^>]*>)((.|\S|\s)*)/';
// TODO: Add check for theme.json presence.
if (
'core/group' !== $block['blockName'] ||
1 === preg_match( $group_with_inner_container_regex, $block_content )
) {
return $block_content;
}
$replace_regex = '/(^\s*<div\b[^>]*wp-block-group[^>]*>)(.*)(<\/div>\s*$)/ms';
$updated_content = preg_replace_callback(
$replace_regex,
function( $matches ) {
return $matches[1] . '<div class="wp-block-group__inner-container">' . $matches[2] . '</div>' . $matches[3];
},
$block_content
);
return $updated_content;
}
add_filter( 'render_block', 'wp_restore_group_inner_container', 10, 2 );