fix: It should be possible to re-add ColorEffect (#2469)

Currently you'll get an error that the late final _original field is already initialized if you re-add effect to a component, since that field is set in onMount. This PR simply removes final from that field so that it can be updated in onMount.

packages/flame/lib/src/effects/color_effect.dart

@@ -13,7 +13,7 @@ import 'package:flutter/material.dart';
 class ColorEffect extends ComponentEffect<HasPaint> {
  final String? paintId;
  final Color color;
- late final ColorFilter? _original;
+ ColorFilter? _original;
  late final Tween<double> _tween;
 
  ColorEffect(

packages/flame/test/effects/color_effect_test.dart

@@ -62,5 +62,28 @@ void main() {
  );
  },
  );
+
+ testWithFlameGame(
+ 'can be re-added in the component tree',
+ (game) async {
+ final component = _PaintComponent();
+ await game.ensureAdd(component);
+
+ final effect = ColorEffect(
+ Colors.red,
+ const Offset(0, 1),
+ EffectController(duration: 1),
+ );
+ await component.ensureAdd(effect);
+ game.update(0.5);
+ effect.removeFromParent();
+ game.update(0.0);
+ component.add(effect);
+ expect(
+ () => game.update(0),
+ returnsNormally,
+ );
+ },
+ );
  });
 }