I think we don't use `this.container` at all (and I checked that we didn't use `this.threadsContainer` before either), so probably you can get rid of this variable and rename the existing `threads-list-container` to `threads-container` instead.

The current `threads-container` is only used when rendering the threads (and in `sms_test.js`), it's not even used in CSS, so it will be easy to change its id. I don't exactly get what it is so I can't come up with a good name though, I leave that as an exercise for you ;)