Ah and another question. What if some node doesn't have image and should
not have any selected image neither? Is it safe to set:

constructor TDataNode.create(const aowner: tcustomitemlist;
  const aparent: ttreelistitem);
begin
  inherited create(aowner, aparent);

  imagenr := imagelist.count * (-1);
  FId := -1;
  FFilename := '';
end;
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