code: func (v *Window) GetIcon() (*gdk.Pixbuf, error) {
  	c := C.gtk_window_get_icon(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	p := &gdk.Pixbuf{glib.Take(unsafe.Pointer(c))}
  	return p, nil
  }
docs: // GetIcon is a wrapper around gtk_window_get_icon().