buildWithChild method
A build method that receives an extra child parameter.
This method may be called with a child different from the parameter
passed to the constructor of SingleChildStatelessModifier.
It may also be called again with a different child, without this widget
being recreated.
Implementation
@override
Widget buildWithChild(BuildContext context, Widget? child) {
  return AnimatedDefaultTextStyle(
    key: modifierKey,
    duration: duration,
    style: style,
    curve: curve,
    maxLines: maxLines,
    onEnd: onEnd,
    overflow: overflow,
    softWrap: softWrap,
    textAlign: textAlign,
    textHeightBehavior: textHeightBehavior,
    textWidthBasis: textWidthBasis,
    child: child!,
  );
}