CircularProgressIndicator is not using ThemeData.backgroundColor by default #77647
Description
According to the documentation [https://api.flutter.dev/flutter/material/ProgressIndicator/backgroundColor.html], a CircularProgressIndicator's backgroundColor should be the current theme's ThemeData.backgroundColor by default.
While it's the case for the valueColor (ThemeData.accentColor by default) it does not work with the backgroundColor.
I think the problem resides in the _buildMaterialIndicator method were the backgroundColor is set to widget.backgroundColor instead of _getBackgroundColor(context).
Widget _buildMaterialIndicator(BuildContext context, double headValue, double tailValue, double offsetValue, double rotationValue) {
return widget._buildSemanticsWrapper(
context: context,
child: Container(
constraints: const BoxConstraints(
minWidth: _kMinCircularProgressIndicatorSize,
minHeight: _kMinCircularProgressIndicatorSize,
),
child: CustomPaint(
painter: _CircularProgressIndicatorPainter(
backgroundColor: widget.backgroundColor,
valueColor: widget._getValueColor(context),
value: widget.value, // may be null
headValue: headValue, // remaining arguments are ignored if widget.value is not null
tailValue: tailValue,
offsetValue: offsetValue,
rotationValue: rotationValue,
strokeWidth: widget.strokeWidth,
),
),
),
);
}