This is actually pretty hard.  It wouldn't be tough to do this on the initial rendering of an open setting, but when you add a new setting value, the currently active setting would change and we would (often) need to update the "current" setting at that point.  That's the challenging part.

One question is: would it be worth it to have this highlighting if it was only accurate when you opened (or reopened) the setting?

Sounds rather confusing if it doesn't update.

  --John Abbe.....Thu Nov 18 15:06:37 -0800 2010

I think I agree. Probably best to build more javascript around this.

  --Ethan McCutchen.....Thu Nov 18 15:56:17 -0800 2010

probably want to wrap into a more substantial rethinking of the settings interface.

  --Ethan McCutchen.....Fri Feb 18 10:27:25 -0800 2011

this is obviated by new settings interface, which never shows more than one rule at a time.

  --Ethan McCutchen.....Tue Nov 29 10:58:44 -0800 2011