Editing variants alongside a teammate no longer loses your changes

When two people edited the same product at once, renaming an option value was treated as a change to the variant structure. The editor then offered one all-or-nothing choice for every variant, and taking the other person's version discarded every price, SKU and stock you had typed. A rename is now merged value by value, like any other field, and only a real change to the options, such as adding one, asks you to choose. Variants are described in Variants.