Registers patterns from Pattern Directory provided by a theme’s
`theme.json` file.

function _register_remote_theme_patterns() {
	/** This filter is documented in wp-includes/block-patterns.php */
	if ( ! apply_filters( 'should_load_remote_block_patterns', true ) ) {
		return;
	}

	if ( ! WP_Theme_JSON_Resolver::theme_has_support() ) {
		return;
	}

	$pattern_settings = WP_Theme_JSON_Resolver::get_theme_data()->get_patterns();
	if ( empty( $pattern_settings ) ) {
		return;
	}

	$request         = new WP_REST_Request( 'GET', '/wp/v2/pattern-directory/patterns' );
	$request['slug'] = $pattern_settings;
	$response        = rest_do_request( $request );
	if ( $response->is_error() ) {
		return;
	}
	$patterns          = $response->get_data();
	$patterns_registry = WP_Block_Patterns_Registry::get_instance();
	foreach ( $patterns as $pattern ) {
		$pattern_name = sanitize_title( $pattern['title'] );
		// Some patterns might be already registered as core patterns with the `core` prefix.
		$is_registered = $patterns_registry->is_registered( $pattern_name ) || $patterns_registry->is_registered( "core/$pattern_name" );
		if ( ! $is_registered ) {
			register_block_pattern( $pattern_name, (array) $pattern );
		}
	}
}