code: func (v *Window) SetWMClass(name, class string) {
  	cName := C.CString(name)
  	defer C.free(unsafe.Pointer(cName))
  	cClass := C.CString(class)
  	defer C.free(unsafe.Pointer(cClass))
  	C.gtk_window_set_wmclass(v.native(), (*C.gchar)(cName), (*C.gchar)(cClass))
  }
docs: // SetWMClass is a wrapper around gtk_window_set_wmclass().