Dashes length should scale with movespeed and thus be affected by slows.

To deal with the fact that we need increasing amounts of CC to counter the mobility creep, punishing normal, immobile champions even more. I mean, c'mon, squishies are supposed to be immobile, Kalista is a living concept bug... (it's an example, I have nothing against Kalista in particular as I almost never see her played). EDIT: in fact, either slow the dash animation, or reduce the length only when it's not used to jump over a wall... which would be hard to implement since walls have no nature in League