This commit removes the unnecessary `data-list-widget` attribute
present in the <div> and <tbody> tag for muted_topics and muted_users table.
It became unnecessary/useless in 19cf6d0e04 and
then was renamed while still useless.
Also uses the correct variable name `muted_topic` and `muted_user`
instead of `muted_topics` and `muted_users` to render a item of their list
in DOM through Listwidget.
Previously, we used to do a kind of "local echo"
whenever the user muted/unmuted a topic. Meaning,
we used to do most of the UI update work before making
the API call to mute the topic, instead of after
receiving the `muted_topics` event. This behavior
has been so since the beginning of time
(b4b6fa14d3) and isn't ideal because:
1. If the request fails on the backend, the UI
could end up in an incorrect state.
2. Adds code complexity.
3. Makes it difficult to catch bugs related to
live-update (like the one fixed by
f725711ff2).
4. Isn't consistent with other parts of the
codebase, which do the UI update while handling
events.
This commit makes it so that all the UI update
work is done only after recieving the `muted_topics`
event.
The only possible issue with this strategy could
be users sending another duplicate request in the small
time span before receiving the event. But that isn't
a big problem, because all requests involved here are
idempotent, and the worst that can happen is a HTTP 400.
Anders Kaseorg
jai2201
Priyank Patel
Abhijeet Prasad Bodas