This should greatly reduce the symptoms of a bug where a stale
realm_users cache (missing a newly created user) results in the web
client missing the new user and throwing exceptions.
This commit updates the traditional url of a channel-topic narrow
to topic permalink upon arrival of new message in the narrow, by
using the `with` operator on it.
The requirement for this change arises when we navigate to an
empty topic. Since it has no messages yet, we fallback to the
traditional channel-topic links. However, when a new message
arrives to this empty topic, we want the url to live update to
a permalink of the narrow.
This is done as an effort to make sure channel-topic narrows
always contain `with` term.
