Function valid

src/laybasic/laybasic/layLayerProperties.h:469–478

* @brief Get the validity state */

   *  @brief Get the validity state
   */
  bool valid (bool real) const
  {
    if (real) {
      ensure_visual_realized ();
      return m_valid_real;
    } else {
      refresh ();
      return m_valid;
    }
  }

  /**
   *  @brief Set the visibility state