code: func (v *Actionable) SetDetailedActionName(detailed_action_name string) {
  	cstr := C.CString(detailed_action_name)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_actionable_set_detailed_action_name(v.native(), (*C.gchar)(cstr))
  }
docs: // SetDetailedActionName is a wrapper around gtk_actionable_set_detailed_action_name().
  // Since 3.4