Comment 66 for bug 1754671

In my opinion it is useful to use split DNS view in all cases and only use never-default setting to decide the global DNS.

Rationale: There is no such think as sending all traffic across VPN, only default route traffic, i.e. traffic for which there's no specific route over a specific interface. As specific routes (as found in the routing table) are still used even with default route over VPN, I believe that specific zones (as found in per-connection lists of domains) should be maintained as well.