[Exim] widen_domains and same_domain_copy_routing

I've been wondering a bit about using same_domain_copy_routing to improve
our list performance, but our dnslookup router uses widen_domains for
hysterical raisins. The text in the spec is a little unclear: "However,
this is only done if "headers_add" and "headers_remove" are unset,
and the router does not 'widen' the domain." Does that apply per-address
or to the router as a whole?

Tony.
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