   yield from @_walk_joint_coordinates_events            me
   yield from @_walk_quad_sides_events                   me
   yield from @_walk_quad_coordinates_events             me
-  yield from @_walk_debugging_events                    me
-  yield from @_walk_quadgrid_events                     me
-  yield from @_walk_borders_events                      me
+  yield from @_walk_debug_joints_events                 me
+  yield from @_walk_debug_quadgrid_events               me
+  yield from @_walk_quad_borders_events                 me
   yield from @_walk_closing_events                      me
   #.........................................................................................................
   # ### dump description for debugging ###

      sDashed:            'dashed'
      sRed:               'red'
      sBlack:             'black'
      sQuadgrid:          'sRed,sDotted,sThin'
      sJoints:            'gray!30,sThick'
    #.......................................................................................................
    default:
      gridwidth:  4

    for row_nr_1 from @_walk_row_numbers me, 'short'
      row_nr_2  = row_nr_1 + 1
      quad = "#{col_letter_1}#{row_nr_1}"
      yield [ 'tex', "\\draw[sDebugQuadgrid] (quad_#{quad} top    left)  -- (quad_#{quad} top    right);%\n",  ]
      yield [ 'tex', "\\draw[sDebugQuadgrid] (quad_#{quad} top    left)  -- (quad_#{quad} bottom left);%\n",   ]
      yield [ 'tex', "\\draw[sDebugQuadgrid] (quad_#{quad} bottom left)  -- (quad_#{quad} bottom right);%\n",  ]
      yield [ 'tex', "\\draw[sDebugQuadgrid] (quad_#{quad} top    right) -- (quad_#{quad} bottom right);%\n",  ]
  #.........................................................................................................
  yield return

#-----------------------------------------------------------------------------------------------------------
@_walk_quad_borders_events = ( me ) ->
  #.........................................................................................................
  for designation, cellquads of me.cellquads
    continue unless ( cellborders = me.cellborders[ designation ] )?
