[racket-dev] more performance feedback in drracket

I've just pushed a change that adds another little status indicator
thingy in the bottom of drracket. If you see a pair of parentheses
down there next to the gc icon that means that the syntax colorer's
internal state isn't up to date and it is working on bringing it back
in sync. Generally speaking, you shouldn't see any difference between
it being on or off in drracket's performance, but if you do notice
something strange and it correlates with that little icon, please do
let us know.

(This is only in the git and nightly build version.)

Robby