I have no idea what Mikolaj tried to fix with this patch but

As I wrote in http://www.winehq.org/pipermail/wine-patches/2007-October/045479.html the problem was in the Photoshop CS2 installer where the groupbox consumed mouse events. They didn't arrive to the edit box (which was created earlier) what caused it to appear to be disabled. I checked that in that installer the groupbox had the BS_GROUPBOX style. Maybe that depends on some flags?

Mikołaj Zalewski