Bug to track moving the m_staticBackground member up and make it cross-platform.
Created attachment 23819 [details]
Oops. Wrong value for m_canBlitOnScroll (hard to notice on Mac, since it really doesn't care about the variable). New patch coming in a sec.
Created attachment 23820 [details]
Comment on attachment 23820 [details]
Looks good with the change discussed in IRC.
Fixed in r36906.