Mix max both equal zero cause BoxConstraints exception

[leduchung]

I built a range slider. If I put max and min both equal 0 as following code:

FlutterSlider(
    values: [_lowerValue, _upperValue],  // both are 0
    touchSize: 5,
    rangeSlider: true,
    trackBar: FlutterSliderTrackBar(
      activeTrackBarDraggable: false,
      inactiveTrackBar: BoxDecoration(
        borderRadius: BorderRadius.circular(20),
        color: Colors.black12,
      ),
      activeTrackBar: BoxDecoration(
        borderRadius: BorderRadius.circular(4.0),
        color: accentBlue,
      ),
    ),
    max: maxValue, // is 0
    min: minValue,  // is 0
)

I got following error when dragging handlers, then all the handlers jump to the top-left of the screen:

The following assertion was thrown building Container(bg: BoxDecoration(color: Color(0xff1884db), borderRadius: BorderRadius.circular(4.0)), constraints: BoxConstraints(NaN<=w<=NaN, h=3.5; NOT NORMALIZED)):
BoxConstraints has NaN values in minWidth and maxWidth.

The offending constraints were: BoxConstraints(NaN<=w<=NaN, h=3.5; NOT NORMALIZED)

Hint from BorderRadius.circular(4.0), I guess the problem is from the activeTrackBar.

P/S: The error occurs when setting all max, min, _lowerValue, _upperValue to any equal number.

[loonix]

Why would you put max and min to be 0. that does not sound like a real world scenario.