jigish/slate — pull request #143 by kvs (2012-11-03 00:26:50+00:00)
Title: Add windowHintsIconAlpha, and draw both rect and icon for window hints.

I'm not sure if this is something you want, or even if it's the way to do it, but it was a simple change.

Personally, I prefer that there's a dark-ish background behind the icon, and giving the icon a good amount of transparency - this way, I'm guaranteed to be able to read the hint-letter. Without the rect behind the icon, the letter would sometimes vanish in the icon or the window behind.