Have ui.set_presence_list() only touch the presence list.
Before this change, it was calling update_unread_counts(), which
has a bunch of side effects unrelated to the presence list.
(imported from commit 690f754d78874a03fa36f8ff8765d5a63e431d28)
This was broken in two ways:
1. Commit ad59d6f78042ce89, "Make the left sidebar and right sidebar
more consistent", pushed last Monday, changed the markup for the right
sidebar without changing a selector in stream_list.js that was looking
for the old markup.
2. Even then, whenever new user presence information came in, we would
rerender the user list and blow away the unread counts. This commit
patches around that by updating unread counts after rendering the user
list. I'm not sure what broke this or how it was working before.
(imported from commit 53ed40139e257e44411e918d1ecdce3a49e9ee51)
There are also one or two places we don't need to use it for security
purposes, but we do so for consistencey.
(imported from commit aa111f5a22a0e8597ec3cf8504adae66d5fb6768)
In a few cases the $.each was doing something imperatively that was
terser and easier to understand by using a different Underscore method,
so a few of these I rewrote.
Some code was using the fact that jQuery sets `this` in the callback to
be the item; I rewrote those to use an explicit parameter.
Some code was using $(some selector).each(callback). I converted these
to _.each($(some selector), callback).
One function, ui.process_condensing, was written to be a jQuery $.each
callback despite being in a totally different module from code using it.
I noticed this and updated the function's args.
(imported from commit bf5922a35f257c168cc09ec1d077415d6ef19a03)
Steve Howell
Scott Feeney
Jeff Arnold
Zev Benjamin
Tim Abbott