This change will allow us to test the muting feature on
staging. Any topic named "muted" will automatically be
muted. You can also mute any other topic on the console:
muting.mute_topic('devel', 'ios');
current_msg_list.rerender();
More UI around this experiment will be coming soon, as well
as support for muting entire streams.
The muting module keeps track of which topics are muted, but a
user can expand muted messages, and once that happens, the
messages are marked with the "force_expand" flag that gets
persisted to the back end.
Muted messages are rendered in similar fashion to the summarized
rows, and as part of unifying some of that code, we have
made it so that expanding a summarized section doesn't remove
individual flags related to summaries; instead, the messages
get the force_expand flag set.
(imported from commit acee4190e63813d46850415c41ff8ebfae4a6953)
Steve Howell