What was happening is that if you un-narrowed immediately after
receiving a message (e.g. because you just sent it), the autoscroll
animation from the zfilt table would still be running after you return
to the home view, resulting in the viewport being scrolled to an
apparently random point in the home view (even though the pointer was
still in the right place).
This cancels the autoscroll animations whenever you do one of:
(1) hashchange (e.g. to go to the settings page)
(2) select a message (covers narrowing/unnarrowing as well as keyboard hotkeys)
(3) mousewheel scroll
since those are basically the cases where we set the viewport
scrolltop directly.
Arguably this should instead be something where we somehow detect
which scroll events are triggered by what and cancel for any scroll
event not from the animation or rererendering, but that seems hard.
(imported from commit f776021303404c87b36241c733b3d1bcb083163b)
...rather than embedding them into index.html.
This is only acceptable for dev, but the next commit adds an alternative
mechanism for prod.
There isn't actually a manual deployment step here. However, this commit won't
work on staging / prod without the next one (since we don't serve
zephyr/static/templates in prod).
(imported from commit dce7ddfe89e07afc3a96699bb972fd124335aa05)
We also needed this when rerendering on append, so moving it into
_maybe_rerender allows the two places to share the code.
(imported from commit 027d99cae7864747cf1ec94c95e8ece495b5c907)
Previously, if the pointer was high on the page such that there was a
lot of empty space below and the render window was full (a situation
we could get into if we're following new messages arriving), a newly
recieved message would not be rendered even though it would have been
visible on the screen if we had done a rerender. Adding the
_maybe_rerender() call to the end of append() ensures that we don't
end up in this situation.
(imported from commit 925d3cc62e8221b42f1d5ff1788e99c7d07ccc24)
The message list data structure never had the rendered_idx values
initiatized except via _maybe_rerender (called when a message is
selected). For the narrowed message list for streams with no messages
yet, we didn't select a message (as there was none to select); the end
result is that msg_list.append() will never rerender because it tries
to subtract undefined from undefined and gets NaN in its test for
whether it needs to rerender.
So fix this by initializing _min_rendered_idx and _max_rendered_idx to
valid values for the empty message list (the closed interval from 0 to -1).
(imported from commit 6afecb1569185a842a3a9108cedba7e88f8befad)
The new message list system can rerender the message list on scroll,
but did not properly re-highlight any messages which were highlighted
at the time the scrolling was initiated due to an open compose box,
this time due to a bug where the meaning of "this" changes when we
moved the rendering code into the message list library.
(imported from commit 26d9716811b56a6f89ae22e68038ad560dcfee64)
The new message list system can rerender the message list on scroll,
but did not properly re-fade any messages which were faded at the
time the scrolling was initiated due to an open compose box.
(imported from commit 4bc7c172e8bb55acfaacc5e5460eb6a2ef9aebe2)
The most expensive part of adding the display time to messages is
calling time.toLocaleDateString() and time.toLocaleTimeString().
Most of the time, this information never gets seen, so we now delay
calculating it until just before the user would see it. This cuts
the time to render a chunk of messages from >1s to ~200ms.
(imported from commit 6167e7a8e1c3b4ca77471fa346292be4ffa67ec8)
Adding the display times to messages is very expensive (> 1s for 400
messages in Chrome on my machine). This commit doesn't directly
address that issue, but does mitigate its affects on scrolling speed
when rendering the next chunk of the message list. After this
commit, rendering a portion of the message list for the second time
only takes ~300ms.
(imported from commit b22badb5dcce69be297f6403b1cb40950e46376e)
Long-term we probably want to pick the render window size and
re-render threshold based on the user's window height instead of
arbitrarily.
When we re-render we probably also want to ensure that the newly
selected message appears in the same location as it would have
before the re-render.
(imported from commit f044b7f2200822e8e6e8dba7108d087a69016134)
By splitting up all_msg_list and home_msg_list, we can properly add/remove
streams from the home view without having to jump through hoops.
(imported from commit 92767197759f7519197dfc58be951b60fa823fbb)
If we have removed a stream from the home view, and our pointer
that we load from the server refers to a message that is no longer
visible, we don't want to error out but rather select the nearest
message to our previously selected one.
(imported from commit d212f1fba7b06836d1d916b43042991625b6f41e)
Messages are now selected on a MessageList, which triggers a
message_selected event that other parts of the code can listen for.
(imported from commit 1da9e4121425c0ac4461b41b7aea169072e1512b)
Tim Abbott
Keegan McAllister
Jessica McKellar
Jeff Arnold
Zev Benjamin
Luke Faraone
Leo Franchi