Reduce search delay

[alt-romes]

Reduces the delay to 75ms. It still isn't instantaneous (hopefully not too jumpy), but the search doesn't feel actually slow anymore.

We can revise this number after using it as this for some time

Fixes haskellfoundation/error-message-index#328

[david-christiansen]

Out of curiosity, where does 75ms come from? Did you try 0ms or 5ms and find that there were problems?

[alt-romes]

Out of curiosity, where does 75ms come from? Did you try 0ms or 5ms and find that there were problems?

Just addressing your concern of "jumpiness". 75ms is enough so that it doesn't feel terribly slow anymore -- that's my main concern. If you think then we can do with a fast, perhaps "jumpy" solution, we can reduce it further.

I don't think there was a problem, no, but I can see how someone would prefer a little bit of a pause.

[david-christiansen]

Let's give it a shot - we can always modify it again later, after all. Thanks!