if( ! function_exists( 'sweethome_custom_property_slider' ) ){
    function sweethome_custom_property_slider( $args ) {
        /**
         * Property IDs string, Separated by commas.
         * Example: $post__in = '3,6,8,9,20,100';
         */
        $post__in = '';

        if( !empty( $post__in ) ){
            $post__in = explode( "," , $post__in);
            if( !empty( $post__in ) && is_array( $post__in ) ){
                $args['post__in'] = $post__in;
            }
        }
        return $args;
    }
    add_filter( 'swh-propertslider-widget/args' , 'sweethome_custom_property_slider', 10, 1);