[IMP] mail: navbar: messaging menu

The navbar notification is now a dropdown containing a preview of all pinned
channels (except Inbox and Starred), channels with unread messages being on the
top.

It allows to quickly detach a channel without going back to Discuss.

The channels preview fetching is performed only once, and it is done in
background without blocking the whole UI (using shadow option or session.rpc()).

Also fixes a synchronization problem between server and client about the folded
state of channels (the info wasn't stored client side, so it produced weird
situations, e.g. unfolding a channel didn't actually unfold it).

0 files changed, 0 insertions, 0 deletions