Don't do anything if sorter was replaced, even for one tick only. Hopefully fixes
issue #907, but not confirmed, though very highly plausible.
team coloured, just for the heck of it, based on a param. also del airmine, 'cause, probably not fun here. you're invuln anyway.
render input prefix independent of inputstr so that e.g. a username will not lead to weirdnesses
attempt to move cursor now removes selection even if cursor cannot actually move in the specified direction