Lately we've been fetching messages only after entering the MUC, so that
we already have occupants to attach to them (due to `fetchMembers` being
called before) and thereby avoid rerenders.
I've now moved message fetching into the `initialize` method and added
missing event handlers for attaching/removing the occupant from a
message as it comes online or goes offline.
We still avoid (some) rerenders because we fetch and wait for cached
occupants before fetching cached messages and we wait for `fetchMembers`
before triggering `enteredNewRoom` which causes MAM messages to be
fetched.
We want to fetch messages from cache only once. For one-on-one chats
this is the case because messages are fetched only in the `initialize`
method.
This used to be the case for MUCs as well, until we added the option
`clear_messages_on_reconnection`.
Now we only fetch messages after the user has entered the MUC.
in which you can set user affiliations and roles.
Also, let getAffiliationList return an Error instead of `null` if you're
not allowed to fetch a particular affiliation list.
Don't remove affiliation for occupants if we weren't allowed to
fetch that particular affiliation list.
Previously, if fetching the list failed, we would return an empty array,
which would imply that the affiliation list is empty and that all
users with the given affiliation should have their affiliations removed.
Instead we now return `null` and properly account for that when setting
affiliations on existing contacts based on the returned member lists.
Includes some refactoring:
- Don't send an `active` chat state notification when entering a MUC
I can't think of a good reason why this might be necessary or desired.
- Move `setChatState` form the view to the model
- Remove unused method `handleChatStateNotification`
- Don't store `role` and `affiliation` for the current user on the
ChatRoom object, but instead on the ChatRoomOccupant object representing
the user.
In some cases, it might be desirable to clear cached chat messages once you've
reconnected to the XMPP server.
For example, if you want to prevent the chat history from getting too long or
if you want to avoid gaps in the chat history (for example due to MAM not
returning all messages since the last cached message).
If you're using OMEMO, then you probably don't want to set this setting to
``true``. OMEMO messages can be decrypted only once, so if they then
subsequently get cleared, you won't get the plaintext back.
This is done to avoid unnecessary repaints and reflows (caused when a
message has already rendered and then an occupant is created and
attached to that message, cauring a re-render).
Related to #1266