wp-includes/block-template-utils.php:558Injects the active theme's stylesheet as a theme attribute into a given template part block.
$blockarrayfunction _inject_theme_attribute_in_template_part_block( &$block ) { if ( 'core/template-part' === $block['blockName'] && ! isset( $block['attrs']['theme'] ) ) { $block['attrs']['theme'] = get_stylesheet(); }}Introduced in 6.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/block-template-utils.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.