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8d1ea1e9c5
This class looks like it _should_ give valid equality checks:
```dart
class _WidgetStateColorMapper extends _WidgetStateColorTransparent {
const _WidgetStateColorMapper(this.map);
final WidgetStateMap<Color> map;
_WidgetStateMapper<Color> get _mapper => _WidgetStateMapper<Color>(map);
@override
Color resolve(Set<WidgetState> states) => _mapper.resolve(states);
@override
bool operator ==(Object other) {
return other is _WidgetStateColorMapper && other.map == map;
}
@override
int get hashCode => map.hashCode;
}
```
But I made a mistake: I should have used `other._mapper == _mapper` and `_mapper.hashCode`.
<br>
It'd be pretty nice if no copy-pasting was needed in the first place:
```dart
class _WidgetStateColorMapper extends WidgetStateMapper<Color> implements WidgetStateColor {
const _WidgetStateColorMapper(super.map);
}
```
<br><br>
This PR makes `WidgetStateMapper` a public class, similar to `WidgetStatePropertyAll`. The new API, when used incorrectly, will `throw` with a detailed error message, rather than silently returning irrelevant values.