TpAccount doesn't automatically create a new TpConnection when the connection_object_path member changes, only when someone actually asks for it.

This has the surprising side-effect that notify::connection isn't emitted when the object path is first discovered.

This block in _tp_account_update:

>   if (g_hash_table_lookup (properties, "Connection") != NULL)

should emit notify::connection; if someone actually cares about it, they'll call tp_account_get_connection (directly or via the property getter), resulting in the creation of a TpConnection.