libtelepathy and telepathy-glib assume that it's OK to call Connect() when the Connection is in the CONNECTING state.

telepathy-glib's tp_connection_run_until_ready() goes further, assuming that if the library user requested that Connect() be called if necessary, then it's OK to call it even before we know what the status is (i.e. before the first GetStatus() has returned).

In practice, I believe all Connect() implementations are idempotent, and silently return success at all times (unless the object has been destroyed as a result of a failed attempt to connect).

However, the spec says:

<tp:error name="org.freedesktop.Telepathy.Error.NotAvailable">
          The connection is already connecting or connected

(the markup is wrong though, so it doesn't show up in the HTML).

I'm inclined to say that Connect() should indeed be idempotent, and we should remove this possible error.

(When we've decided which it should be, please tell mardy - MC makes a similar assumption.)