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SOLVED Cart merging problem (SUPEE-7978)

SOLVED Cart merging problem (SUPEE-7978)



I upgraded from to, but it seems that the merging process in cart is not working, even if the core code seems to be well updated.


It creates a new item in cart each time a product is added to cart, not matter if the product is already in cart.


However, if if update the quantity in cart.html with the input box, it works well.


What can i check to assure it works fine?


Thank you,





works fine now.