Fix field list in Delphi < XE6 not updating after CloseOpen

[EchseKuhTiere]

Reproduced it in Delphi 7 with fibPlus 7.6 using the TpFIBDataSet component

procedure testCloseOpen();
begin
  with FibDataSet do
  begin
    Close;
    SQLs.SelectSQL.Text := 'select id, name, age from table';
    CloseOpen;
  end;
end;

procedure testOpen();
begin
  with FibDataSet do
  begin
    Close;
    SQLs.SelectSQL.Text := 'select id, name from table';
    Open;
  end;
end;

procedure main();
begin
  testCloseOpen;
  testOpen; // error: field 'age' not found
end;

I guess when 'DefaultFields' got deprecated since Delphi XE6 the propery in FIBDataSet was renamed to remove the reference.
It needs to be restored for old Delphi versions.

[madorin]

@EchseKuhTiere , it seems the entire property and the related GetDefaultFields function should be removed completely in latest Delphi versions.
Can you check, please, if the issue is fixed in this branch https://github.com/madorin/fibplus/compare/58-default-fields
Unfortunately, I don't have an older Delphi version installed
Many thanks,

[EchseKuhTiere]

@madorin
Sorry for the late reply.
It's working but there's now another incompatibility for Delphi 7 due to this change: #73

Coming from TFIBWideStringField.GetAsString

    Result := inherited; // [Error] FIBDataSet.pas(2018): Incompatible types