Fix for themes that use javascripts for quantity fields

functions.php

<?php

if ( defined( 'YITH_YWRAQ_PREMIUM' ) ) {
 function ywraq_print_my_inline_script() {
 
      ?>
      <script type="text/javascript" charset="utf-8">
                jQuery(document).on('ywraq_table_reloaded', function ($) {
                    jQuery(document).find( 'div.quantity:not(.buttons_added), td.quantity:not(.buttons_added)' ).addClass( 'buttons_added' ).append( '<input type="button" value="+" class="plus" />' ).prepend( '<input type="button" value="-" class="minus" />' );

                });
      </script>
      <?php
 
 }
 add_action( 'wp_footer', 'ywraq_print_my_inline_script', 99 );
}