stop_previewing_theme example

        $data = apply_filters( 'customize_changeset_save_data', $data, $filter_context );

        // Switch theme if publishing changes now.         if ( 'publish' === $args['status'] && ! $this->is_theme_active() ) {
            // Temporarily stop previewing the theme to allow switch_themes() to operate properly.             $this->stop_previewing_theme();
            switch_theme( $this->get_stylesheet() );
            update_option( 'theme_switched_via_customizer', true );
            $this->start_previewing_theme();
        }

        // Gather the data for wp_insert_post()/wp_update_post().         $post_array = array(
            // JSON_UNESCAPED_SLASHES is only to improve readability as slashes needn't be escaped in storage.             'post_content' => wp_json_encode( $data, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT ),
        );
        if ( $args['title'] ) {