We only want the row's activatable widgets to get focus, not the rows themselves.

Opened new Account, selected XMPP with the keyboard, and focus went directly to the Username entry, instead of the row around it. Similarly, switching proxy on focused the Hostname entry directly instead of the row it's in.
Tabbing from the Username then continued down the entries only, the "Require password" switch, the "Use custom avatar" switch (and the image/remove buttons if I toggled that on), the activatable widgets in the Advanced Options (if enabled), and similar for the Proxy fields.