Color picker type MaterialPicker visibility problem

[BoHellgren]

I am using FormBuilderColorPicker(colorPickerType: ColorPickerType.MaterialPicker).
This is a very nice picker, but it has a problem. Many users complain that they cannot see which color they have chosen. If you look closely, the selected color is surrounded by very faint lines in the same color. They are almost invisible. If the lines were black, there would be no problem to see what you have chosen.

[BoHellgren]

I changed
D:/flutter_windows/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_colorpicker-0.3.4/lib/src/material_picker.dart line 211 from
border: _color == Theme.of(context).cardColor
to
border: _currentShading != _color
and line 213 from
: null,
to
: Border.all(color: Colors.black, width: 5.0),

This solves the problem, but it is a hack which I don't like. Could you please fix it in the next update.