How can a breaking change of Flutter SDK handled in a package - flutter

Question

https://flutter.dev/docs/release/breaking-changes/parent-data-widget-generic-type
I recently noticed this breaking change being planned for ParentDataWidget.
If the generic type of ParentDataWidget is RenderObjectWidget as should be in the current latest v1.12.13+hotfix.8 of the Stable branch, Flutter v1.13.7 and newer versions complain about it.
Is there any workaround to support both versions before and after the breaking change?
On v1.12.13+hotfix.8
class FrogSize extends ParentDataWidget<FrogJar> {
...
}
After v1.13.7
class FrogSize extends ParentDataWidget<FrogJarParentData> {
...
#override
Type get debugTypicalAncestorWidgetClass => FrogJar;
}

Answer 1

Try this. I used dev branch to compile the following code but hope works for your specific version too.
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'stack.dart';
class CircleContainer extends ParentDataWidget<CircleStackParentData> { //<== Changed CircleStack to CircleStackParentData
const CircleContainer({
Key key,
this.width,
this.height,
#required Widget child,
this.degree,
this.distance = 0.0,
this.rotate = 0.0,
this.align = Alignment.topLeft,
}) : assert(width == null || width > 0.0),
assert(height == null || height > 0.0),
assert(child != null),
assert(distance != null),
assert(rotate != null),
assert(align != null),
super(key: key, child: child);
final double width;
final double height;
final double distance;
final double degree;
final double rotate;
final Alignment align;
#override
void applyParentData(RenderObject renderObject) {
assert(renderObject.parentData is StackParentData);
}
#override
void debugFillProperties(DiagnosticPropertiesBuilder properties) {
super.debugFillProperties(properties);
properties.add(DoubleProperty('width', width, defaultValue: null));
properties.add(DoubleProperty('height', height, defaultValue: null));
}
static CircleContainer of(BuildContext context) {
return context.findAncestorWidgetOfExactType<CircleContainer>();
}
#override
Type get debugTypicalAncestorWidgetClass => CircleStack; //<== New added line
}
//New Added Class
class CircleStackParentData extends ParentData {
double width;
double height;
double distance;
double degree;
double rotate;
Alignment align;
}