In pm_conversations.js, added function to make a user a PM partner and
another function to check if a user is a PM partner. A PM partner is
someone with whom the user has been in a PM with.
Before this fix, if you scrolled back in your PM history for a
person that you've had recent conversations with, then we would
backdate the record of their most recent conversation, and this
would make the sort ordering under the "Private messages"
section incorrect.
This commit fixes this error by re-writing the function
message_store.insert_recent_private_message() to check any
prior timestamps for that user. It also optimizes the function
a bit to short-circuit in O(1) time for cases where a recipient
already has a more recent timestamp, by having a Dict keyed
on user_ids_string.
Earlier commits removed all uses of page_params.email outside
of people.js, and it turns out we have page_params.user_id, so
we don't even need page_params.email for seeding the data.
This commit doesn't change any behavior yet, but it starts us
down the road of deprecating page_params.email and allowing
people.js to control all access to the current user's email,
which will be important for email changes.
* In most cases, eslint --fix with the right comma-dangle settings was
able to update the code correctly.
* The exceptions were cases where the parser incorrectly treated the
arguments to functions like `assert_equal` as arguments; we fixed
these manually. Since this is test code, we can be reasonably
confident that just fixing the failures suffices to correct any bugs
introduced by making changes automatically.