code: func FrameExtentsSet(xu *xgbutil.XUtil, win xproto.Window,
  	extents *FrameExtents) error {
  	raw := make([]uint, 4)
  	raw[0] = uint(extents.Left)
  	raw[1] = uint(extents.Right)
  	raw[2] = uint(extents.Top)
  	raw[3] = uint(extents.Bottom)
  
  	return xprop.ChangeProp32(xu, win, "_NET_FRAME_EXTENTS", "CARDINAL", raw...)
  }
docs: // _NET_FRAME_EXTENTS set