Add in a check to `recent_topics_data.process_message` so that we
know if any conversation data was updated and can rerender the
based on that information.
As of 550a32b, when private messages were added to recent
conversations, `recent_topics_data.process_message` will
always return true.
Updates `recent_topics_data.process_message` for no return
value. Also, removes the `topic_data_changed` logic from
`recent_topics_ui.process_messages` and instead checks for
messages to process before updating the data and calling the
rerender.
`recent_topics_ui.complete_rerender` first checks for whether
the recent conversations view is visible before rerendering.
This commit adds private messages to the Recent topics view, to make
it an all-encompassing overview of recent activity visible to the user.
We add a filter "Include PM" to toggle whether PMs should be shown in
recent topics.
Fixes#19449.
We split recent_topics module into recent_topics_(ui + data + util).
This allows us to reduce cyclical dependencies which were
created due to large list of imports in recent topics. Also, this
refactor on its own makes sense.