Rationale:
- Snikket is focused mostly on the private group chat use-case, not public
channels. Usually the preference is for notification on all messages in
private groups.
- This is the default behaviour on the server side, unless overridden by the
client.
- The server can't default to "mentioned" because it doesn't necessarily know
the user's nick within a MUC.
- The client doesn't configure immediately upon joining a MUC (actually only
when the user explicitly modifies the MUC notification settings, currently)
In the future it would be good if we can default to "mention" for public MUCs,
but this will probably need a bit more work and possibly client-server
protocol changes.
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