pertinent get_slides

metaSlider.php

<?php
    /**
     * The main query for extracting the slides for the slideshow
     */
    public function get_slides() {
        $args = array(
            'force_no_custom_order' => true,
            'orderby' => 'menu_order',
            'order' => 'ASC',
            'post_type' => 'attachment',
            'post_status' => 'inherit',
            'lang' => '', // polylang, ingore language filter
            'suppress_filters' => 1, // wpml, ignore language filter
            'posts_per_page' => -1,
            'tax_query' => array(
                array(
                    'taxonomy' => 'ml-slider',
                    'field' => 'slug',
                    'terms' => $this->id
                )
            )
        );

        $args = apply_filters('metaslider_populate_slides_args', $args, $this->id, $this->settings);

        $query = new WP_Query($args);

        return $query;
    } 
    ?>