A new option, "Must be bundled with specified products," has been added to the restriction type in Bundle Rules.
This lets you restrict the target product so it can only be purchased together with a specified product. Unlike "with other products" (which allows any product), this option's distinguishing feature is that you can specify exactly which product is required alongside it.
For example, in a case like "I want snowboard covers to only be purchasable together with a snowboard," previously you would have needed a roundabout setup using excluded products to exclude all other products. With "Must be bundled with specified products," you can now set this up directly without that hassle.
It's fine if products other than the target product and the specified product are also included in the cart. No restriction is applied to the specified product side.
When this restriction type is selected, "All products" cannot be specified as the target product, and the alert message display timing is automatically fixed to "Checkout only." You can select this option from "Restriction type" → "Cannot be purchased alone" in the Bundle Rule creation/edit screen.
