NOt SOLVED in production
The fix involves the file: themes/classic/_dev/js/listing.js -> That _dev folder is not present in production files....
https://github.com/PrestaShop/PrestaShop/commit/36cdc6b3fa468789bf6eec9931da32803ee3803b
Any clue how doest it solve the problem with the current files ???
Im running latest version of prestashop 1.7.8.3 and the problem is still present.
Thanks,
Pepe