When I change the background editor Alpha to less than 1, I see the color change reflected. So, apparently this will happen in Leopard, but it is particularly pronounced in Snow. I've made sure that the installation is totally clean.
From my exploration on this in Leopard (KinemeCore overrides the background portion to give editors true transparency) the reason it's more pronounced on SL is due to how it renders the editor -- on Leopard, it redraws everything every time (using Quartz) -- kinda expensive, but reliable. On Snow Leopard, I _think_ they're reusing the previously drawn stuff when scrolling (-[NSClipView setCopiesOnScroll:(BOOL)copies]), so instead of "starting fresh" every frame like Leopard does, SL reuses as much of the previous editor view as possible to reduce rendering work. A good decision but, as you've noticed, it doesn't work particularly well with non-opaque colors :)
-- [ christopher wright ] [email protected] http://kineme.net/
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