Show matched search topic at top of topic dropdown

[nixta]

If I search for a topic, the topics dropdown shows the best matching result at the bottom of the list.

I'm sure the Chosen.js library is being lazy by just scrolling the best option into view, but it's not a good experience.

Perhaps the list should only show matching options. In the above screenshot, do I want too see "r", "real-time" and "ruby"?