Neat things about Unity #457: Intelligent launchers.
“…when you drag a certain file type into the launcher the application that launches it stays lit, but the rest “shut off”.
So assuming you have say, GIMP and Shotwell in your launcher dragging a .png close to the launcher will keep those lit and the ones that don’t support .png will not be lit. “
Taking the words out of my mouth when he calls this “Small, but slick.”
Via Jorge’s Stompbox