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Details:
  Tidying a selection of icons could result in icons being placed at locations
  already occupied by other icons. The reason for this is that tidying iconised
  window icons didn't check at all whether a position was occupied or not, and
  tidying file icons only checked against the list of iconised window icons.
  Essentially the code was designed for tidying all icons on the Pinboard, not
  selections.
Admin:
  Tested on Iyonix RO5.11
Changes by:
  Fred Graute

Version 0.87. Tagged as 'Pinboard-0_87'