;; (blueish) or mail (greenish), have states (large number of under
;; messages, normal, and empty). The large number unread groups have
;; highest luminance (appear brighter), and the empty one have lower
;; (blueish) or mail (greenish), have states (large number of under
;; messages, normal, and empty). The large number unread groups have
;; highest luminance (appear brighter), and the empty one have lower