[Lazarus] spinedit issue with qt5

[Luca Olivetti via Lazarus]

Lazarus 1.8.4, FPC 3.0.4, x86_64-linux-qt5

In a spinedit, if I set maxvalue and minvalue to 0, the spinedit doesn't 
work with the qt5 widgetset.

I see that in qtswsspin.pp

    if (ACustomFloatSpinEdit.MaxValue > ACustomFloatSpinEdit.MinValue) then
    begin
      ASpinWidget.setMinimum(ACustomFloatSpinEdit.MinValue);
      ASpinWidget.setMaximum(ACustomFloatSpinEdit.MaxValue);
    end
    else
    begin
      ASpinWidget.setMinimum(-MaxDouble);
      ASpinWidget.setMaximum(MaxDouble);
    end;


so at first sight it seems it should work, but the implementation of 
setMinimum and setMaximum is


procedure TQtSpinBox.setMinimum(const v: Double);
begin
  QSpinBox_setMinimum(QSpinBoxH(Widget), round(v));
end;

procedure TQtSpinBox.setMaximum(const v: Double);
begin
  QSpinBox_setMaximum(QSpinBoxH(Widget), round(v));
end;



and, while round(-MaxDouble) works, round(MaxDouble) silently fails 
(linux/x64, it gives an FPE exception under win32).

There's no such problem with gtk2 because the underlying widget is 
floating point based.


Bye
--
Luca Olivetti
Wetron Automation Technology http://www.wetron.es/
Tel. +34 93 5883004 (Ext.3010)  Fax +34 93 5883007
--
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