Don't remove cached presences in `afterTearDown` event.
We might reconnect again and resume the session, in which case we need
that data still.
Instead, we remove cached presences when `clearSession` fires, because
then we know we're not reconnecting.
When reconnecting, we don't fetch presences from cache, we still have
them (since we no longer remove them in `afterTearDown`).
When reconnecting and not resuming, we clear the presences from cache,
since we're starting a new session.
If we've fetched the roster before within this session, then we don't
have to do so again, regardless of whether versioning is supported or
not, otherwise, even if we have a cached roster, we still need to get
the latest one again.
- Set roster_fetched flag when we get an empty IQ[type="result"] stanza
- Set `restored` flag when resuming in converse-smacks
- Don't trigger change event when fetching xmppstatus values
- Removed two events, since we can just listen to `change` on `_converse.xmppstatus`.
- Use native `getTime` method instead of moment's `valueOf`
- Use toISOString() instead of moment().format()
This makes the code timezone independent since we're now globally using UTC.
- Let box_id start with char for valid HTML.
- No need to use SHA1 for box id
- No need for the user_id attribute.
- Set nickname when we set the roster contact.
Also...
- _converse.api.contacts.get is now async
- _converse.api.chats.create is now async
Set reference to roster contact on the message and chatbox object and
listen for changes to the nickname.
Currently, because chat boxes are fetched and initialized before the
roster, messages and chats are repainted with the correct display name
only later, causing a "flash" effect.
Ideally we would only initialize the chat boxes after the roster
contacts have been fetched, but this is currently not easily possible
because we need the control box to render before everything else.
When no status message is in a presence stanza, the value gets set to
undefined, so we might as well make this the default value to avoid
unnecessarily triggering change events.
