Function set_dither_pattern

src/laybasic/laybasic/layLayerProperties.h:345–352

* @brief Set the dither pattern index */

   *  @brief Set the dither pattern index
   */
  void set_dither_pattern (int index)
  {
    refresh ();
    if (m_dither_pattern != index) {
      m_dither_pattern = index;
      need_realize (nr_visual);
    }
  }
  
  /**
   *  @brief Get the effective dither pattern index