rem: static int onScreen(WScreen *scr, int x, int y, int sx, int ex, int sy, int ey)
add: onScreen(WScreen *scr, int x, int y, int sx, int ex, int sy, int ey)
context: static int onScreen(WScreen *scr, int x, int y, int sx, int ex, int sy, int ey){    WMRect rect = { (x), (y), (ICON_SIZE), (ICON_SIZE) };    int flags;     wGetRectPlacementInfo(scr, rect, &flags);    return !(flags & (XFLAG_DEAD | XFLAG_PARTIAL));}