yes, I think it's true that this is the only blacklight javascript that uses jquery_ujs.

I hesitate to add a hard-dependency on jquery_ujs in our assets, in case people want to swap it out for something else or load those jquery dependencies outside of the asset pipeline. They way it's written, though, should gracefully degrade without `jquery_ujs` (minus the search context on the results pages).

I think bringing in the dependency (which, I believe is generated by default these days?) isn't a big deal, and probably better than having a Blacklight-custom version anyway.