Merge branch 'dev_yy' into dev

yanyuan

2023-09-06 d741e529a05597074596281f999c5c82f18f1363

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Quintiq file version 2.0
#parent: #root
Method ToggleIsSeen
{
  Description: 'Toggle the `IsSeen` attribute of this issue.'
  TextBody: 'this.IsSeen( not this.IsSeen() );'
}