How to update all quantities from the cart page in one click

I was recently asked by one of my customers how he could have a button to save all quantities in the cart in one click.
Indeed his cutomers do recurring orders and have several line items for each order. With the help of our clone order plugin, they can quickly add all the products from a former order to their cart.
However this will copy the quantites over and from time to time, they might want to change the number of each item.


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