border method
Replaces border color and/or width on supported widgets (Container).
At least one of color or width must be supplied.
Implementation
void border({ColorToken? color, double? width}) {
if (color == null && width == null) {
throw ArgumentError('border(...) requires color, width, or both.');
}
_border = BrownfieldBorderPatch._(color: color, width: width);
}