[Plugin: WooCommerce – excelling eCommerce] Bug in WooCommerce_Widget_Product_Categories

There is a bug in WooCommerce when using it with WPML and language indication way via ?lang=XX parameter.

The bug can be found here:

<script type='text/javascript'>
            /* <![CDATA[ */
                var dropdown = document.getElementById("dropdown_product_cat");
                function onCatChange() {
                    if ( dropdown.options[dropdown.selectedIndex].value !=='' ) {
                        location.href = "<?php echo home_url(); ?>/?product_cat="+dropdown.options[dropdown.selectedIndex].value;
                    }
                }
                dropdown.onchange = onCatChange;
            /* ]]> */
            </script>

echo home_url() produces for example https://site.com/?lang=es and then you add /?product_cat=XXXX resulting https://site.com/?lang=es/?product_cat=XXXX

Can be seen here:
https://fridja.com/product-category-f-1000-fr/?lang=fr

I consider it a bug because you may not rely on home_url() this way since it may be filtered by plugins (as in this case).