KNS being, at times, a little twitchy means that we have to handle
such things a bit more gracefully. As such, without this code,
the KNS backend would remain in a perpetial search state after
startup, which would result in inconsistencies.

Implement UI feedback for long-running searches, and no-results

If a search takes longer than a couple of seconds, a spinner
will face-and-slide in from the bottom of the view. If it then
takes a while longer, a text saying "Still looking" will fade in
very slowly. If the search is near-instant (the general case),
the spinner does not show up.