This field is convenient for bankruptcy checks. Clients could
calculate it from page_params.unread_msgs before this change, but
it would kind of a painful calculation.
To add count, we had to simplify the mypy annotations, which weren't
really accurate before.
Previously, when you switched to a stream narrow with the central
message outside the range of messages cached in the browser, we would
reset the UI for loading more messages, but not actually reset the
state for whether it should be possible.
This seems to have been an oversight in refactoring back in 2014.
Fixes#6109.
With this flag turned on, all streams will have a "more topics"
link, and clicking that link will always fetch topics from the
server to show a complete list of topics that you have had messages
for on that stream.
Note that if you only recently joined a public stream, your list
of topics won't go back to before you joined the stream, even though
that content is searchable. We may change that in the future, but
we will need to be careful about spamming folks who frequently
unsubscribe from streams.
Until we have an easy way to consistently determine whether a
stream has more topics than have been loaded already, we err
on the side of showing a "more topics" link. This in some ways
leads to a more consistent experience where you can zoom in on
any stream, even one that's really new.
This fix simplifies how we re-render topic lists when we
re-narrow or zoom out from a topic list.
* The topic_list.zoom_out() no longer gets called as
part of re-narrowing, and we eliminate the clear_topics
option.
* For all situations where we narrow to a filter that does
not have a topic, we simply call the new function
clear_topics().
* The stream_list code no longer calls remove_expanded_topics()
in cases where the new narrow has a topic. This allows us
to optimize away scroll/flicker churn a little more easily.
As part of this, we rename maybe_activate_stream_item() to
update_stream_sidebar_for_narrow(), since the function clears
stuff as well as turning stuff on.
This is mostly a pure code extraction. It makes the call
to reset_to_unnarrowed() happen later in sequence.
The order of operations here is mostly unimportant, but
there may actually be some tiny user-facing benefit
in terms of having the logic happen more sequentially.
BEFORE:
reset streams
fix top left
redraw streams
AFTER:
fix top left
reset streams
redraw streams
If you go into "more topics" for a stream with many topics,
and then scroll down, and then zoom out again with "All
streams", we make sure the active stream is still in view.
We have code that can automatically scroll an element into "view"
in its container. We use this for stream sidebar rows inside the
stream list.
Generally the stream sidebar rows are small enough to fit into
the container, and the prior algorithm worked correctly for that
scenario.
If you have lots of topics, however, and a short screen, the
algorithm was being too aggressive. For example, if the top
wasn't showing, it would scroll the top into view, but at the
cost of scrolling the bottom out of view.
This fix makes the general scrolling algorithm more tame.
Part of the user-facing problem is that the element we pass
into the scrolling code for the stream sidebar rows is bigger
than the part of the row that actually should be shown on
screen. Nevertheless, it makes sense here to make the general
algorithm more robust.
If you read a message, then got a topic edit for it, we were
adding the message to our data structure of unread stream/topic
messages.
Now we guard against this in unread.update_unread_topics. I
no longer expose an update() method in unread_topic_counter,
since we really want to do the unread check at a higher level
to keep other data structures consistent.
Category 'All' -> text 'Filter by category'; icon chevron right when
the dropdown is closed, icon chevron down when the dropdown is open
All other categories -> text CATEGORIES[state.category]; icon chevron down
Steve Howell
Tim Abbott
Brock Whittaker
rht
Greg Price
Jack Zhang