I need to prevent the cart from merging in a way that only old items remains in the cart, so:
- guest user adds an item to the cart
- guest user logs in
- customer cart had already an item inside
- on merging, guest items are discarded and only old items remain in the cart
Currently, whatever I do, I'm able to keep the new items and discard the old ones, but I'm not able to do the reverse.
I tried both
sales_quote_merge_after but the result is still the same: when I clear the quote with
only the old items are removed, the guest items are preserved.
Is there a way to do the opposite?