Add 'Keep both' option for ai diffs

Occasionally when reviewing ai generated diffs I'd like to be able to accept the addition but also keep the (pending) deletion. For example in the follow screenshot I'd like to add both the green and the red lines:

Would you consider an additional button saying something like "Keep both" to allow for this scenario?

I think this would only make sense on a per diff basis (ie not at the top at script level).

What do you think?