http://bugs.winehq.org/show_bug.cgi?id=22952
--- Comment #6 from Nikolay Sivov bunglehead@gmail.com 2010-05-30 17:11:39 --- Hi, Dylan.
Recently I changed caret bitmap creation a bit (commit dcddea361f3cd2717c92757adddb87badc55d3ff). I verified this using a single window app with background filled with grey and black stripes. The goal was to remove dependency of a theme colour, cause windows doesn't depend on it - it just inverts colour. I don't think this change caused a problem but you still could check.