start_capturing_option_updates example

        if ( ! did_action( 'customize_preview_init' ) ) {
            foreach ( $this->manager->settings() as $setting ) {
                if ( $setting->id !== $setting_id ) {
                    $setting->preview();
                }
            }
        }

        $this->start_capturing_option_updates();
        $parsed_id   = $this->parse_widget_id( $widget_id );
        $option_name = 'widget_' . $parsed_id['id_base'];

        /* * If a previously-sanitized instance is provided, populate the input vars * with its values so that the widget update callback will read this instance */
        $added_input_vars = array();
        if ( ! empty( $_POST['sanitized_widget_setting'] ) ) {
            $sanitized_widget_setting = json_decode( $this->get_post_value( 'sanitized_widget_setting' ), true );
            if ( false === $sanitized_widget_setting ) {