rem: WMRect rect = {x, y, ICON_SIZE, ICON_SIZE};
add: WMRect rect = wmkrect(x, y, ICON_SIZE, ICON_SIZE);
context: 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));}