tab completion for ssh using FQDN

[TJ Luoma <luomat@xxxxxxxxx>]

I have several hosts defined in ~/.ssh/config like so:

Host myhost
       HostName myhost.luo.ma
       User myuser
       Port 5555

Something changed, because now when I type "ssh my[tab]" I get "ssh
myhost.luo.ma" instead of "ssh myhost" which then fails because it
isn't using the port specified in ~/.ssh/config.

I _think_ it has to do with the ~/.ssh/known_hosts file, because if I
delete the entry from that file, tab completion seems to work as I
expect.

I've looked around for a solution, and it appears that if I add this line:

       HostKeyAlias myhost

then the short hostname gets uses for the known_hosts file, but I'm
not sure if that's a "good" solution or not.

Is there a way to tell zsh to only do tab-completion for ssh out of
~/.ssh/config and ignore ~/.ssh/known_hosts ?

Thanks!

--
TJ Luoma
TJ @ MacStories
Personal Website: luo.ma (aka RhymesWithDiploma.com)
Twitter: @tjluoma