Improve topic search suggestions.

[showell]

No description provided.

[timabbott]

Merged, thanks @showell!

I think in theory we could replace the second commit with adding a callback; stream_topic_history_util.get_server_history(stream_id, () => {}); passes an empty callback, and I think if that just called whatever function that will refresh the search box (idunno if bootstrap typeahead has a good way to do this).

[showell]

Merged, thanks @showell!

I think in theory we could replace the second commit with adding a callback; stream_topic_history_util.get_server_history(stream_id, () => {}); passes an empty callback, and I think if that just called whatever function that will refresh the search box (idunno if bootstrap typeahead has a good way to do this).

I am a bit skeptical of trying this. I think in ~50% of the cases, the server response won't arrive until the user hits the next keystroke, or, even worse, it will arrive just as the user is about to select a choice, and then we will end up pulling the rug out from the user. I have dealt with other apps that overly churn the autocomplete results, and it's annoying.