wp-includes/block-supports/layout.php:1062Check if the parent block exists and if it has a layout attribute.
$parsed_blockarray$source_blockarray$parent_blockWP_Blockarrayfunction wp_add_parent_layout_to_parsed_block( $parsed_block, $source_block, $parent_block ) { if ( $parent_block && isset( $parent_block->parsed_block['attrs']['layout'] ) ) { $parsed_block['parentLayout'] = $parent_block->parsed_block['attrs']['layout']; } return $parsed_block;}Introduced in 6.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/block-supports/layout.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.