Don't set lastMessage, let it update itself as needed, such as when
first rendering a conversation list item, and when its messages are
sent, received, or destroyed.
Let received_at be the current time for keychanges. This avoids them
being inserted in the wrong place in the thread.
Use the newmessage event to trigger frontend listeners to add them to
the conversation view if it is open.
Turns out there's no garauntee that Android will send us contact info
with phone numbers in e164 format. When that happens, we fail to update
the correct contact. Fix by performing validation on the incoming number
before attempting to merge changes to the name, avatar, or color.
Fixes#903
Add a special type of collection just for retrieving group ids, which
doesn't incur the overhead of initializing a conversation model along
with all its group members.
There are some cases when we want to initialize a group object without
loading its contacts, such as while processing delivery receipts. We
really only need to load the contacts for a group/convo when we are
rendering it, so let the front end handle those cases (which most of
them do already).
TimestampView's getRelativeTimeSpanString called moment() twice while
calculating the timeout. If there was a minute/hour/day wrap between
these 2 calls, the calculated delay was 0 and thus no timer was
scheduled, since if (this.delay) evaluated to false.
Fixes: #857, #460
// FREEBIE
Usually new elements are inserted in a predictable order relative to the
sort order of the models/collection, but it's not garaunteed. This fixes
up message element insertion to handle the general case where elements
can be added in any order and must be displayed in correct order as
determined by the collection's sort function. In the worst case, we'll
have to iterate over the entire list of elements to find the right spot,
but in practice most of the time we can short circuit based on the index
of the model or by looking for the predecessor or successor of the
element in question.
