While it is possible to have `stream.recipient_id` being `None`,
the code works under the assumption that it is not. Potentially
we will get a runtime error, but it is not quite explicit without
the assertion.
Signed-off-by: Zixuan James Li <p359101898@gmail.com>
Add none-checks, rename variables (to avoid redefinition of
the same variable with different types error), add necessary
type annotations.
This is a part of #18777.
Signed-off-by: Zixuan James Li <359101898@qq.com>
We remove one call to get_occupied_streams to get occupied
streams before unsubscribing because we already know which
streams can become vacant, i.e. the one from which users are
being unsubscribed, and we can directly use the list of streams
from which users are being unsubscribed and get vacant streams
by checking which of these streams are not in get_occupied_streams
called after unsubscribing users.
Previously, we were marking messages of all the streams passed
to bulk_remove_subscriptions even if user was not subscribed
to some of them and those streams would ideally not have
any unread messages. This code was added in 766511e519.
This commit changes the code to only mark messages of actually
unsubscribed streams as read.
Zixuan James Li
Zixuan James Li
Sahil Batra
Anders Kaseorg