Lines:

<?php

/**
 * Layout block support flag.
 *
 * @package WordPress
 * @since 5.8.0
 */

/* function wp_register_layout_support() – Registers the layout block attribute for block types that support it. */

/* function wp_get_layout_style() – Generates the CSS corresponding to the provided layout. */

/* function wp_render_layout_support_flag() – Renders the layout config to the block wrapper. */

// Register the block support.
WP_Block_Supports::get_instance()->register(
  'layout',
  array(
    'register_attribute' => 'wp_register_layout_support',
  )
);
add_filter( 'render_block', 'wp_render_layout_support_flag', 10, 2 );

/* function wp_restore_group_inner_container() – 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. */

add_filter( 'render_block_core/group', 'wp_restore_group_inner_container', 10, 2 );

/* function wp_restore_image_outer_container */

add_filter( 'render_block_core/image', 'wp_restore_image_outer_container', 10, 2 );
 

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