lerp of ChipThemeData.side is wrong when b is null #173161
Description
Steps to reproduce
The lerp method of ChipThemeData for side doesn't work well when b is null.
Expected results
I expect the transistion to be smooth
Actual results
There is a back and forth in the transition
Code sample
Code sample
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
BorderSide? _side;
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(chipTheme: ChipThemeData(side: _side)),
home: Scaffold(
body: Center(
child: ActionChip(
label: Text('Chip'),
onPressed: () {
setState(() {
if (_side == null) {
_side = BorderSide(width: 5, color: Colors.red);
} else {
_side = null;
}
});
},
),
),
),
);
}
}