Merge branch 'dev_yy' into dev

yanyuan

2023-09-05 c179ab5f3f347b5b6acd6066dadd23c8031a486b

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Quintiq file version 2.0
#parent: #root
Method ShowEdges
{
  Description: 'Unhide the edges from the user'
  TextBody:
  [*
    // tyg2 May-24-2016 (created)
    // to be overloaded in subclass
  *]
}