As BiGgUn suggests, in TRACKBAR_InitializeThumb, setting: infoPtr->uThumbLen = 21;
In this case 21 is a magic number. In fact, infoPtr->uThumbLen equals SM_CYCAPTION.
From the Wine include file:
winuser.h:#define SM_CYCAPTION 4
So I don't think we want to use that value.
