WP_Media_List_Table::current_action()

	public function current_action() {
		if ( isset( $_REQUEST['found_post_id'] ) && isset( $_REQUEST['media'] ) )
			return 'attach';

		if ( isset( $_REQUEST['parent_post_id'] ) && isset( $_REQUEST['media'] ) )
			return 'detach';

		if ( isset( $_REQUEST['delete_all'] ) || isset( $_REQUEST['delete_all2'] ) )
			return 'delete_all';

		return parent::current_action();
	}