fix: Invalidate polygon cache on resize (#1529)

packages/flame/lib/src/geometry/polygon_component.dart

@@ -157,6 +157,7 @@ class PolygonComponent extends ShapeComponent {
     final position = absoluteTopLeftPosition;
     if (!_cachedGlobalVertices.isCacheValid<dynamic>(<dynamic>[
       position,
+      size,
       scale,
       angle,
     ])) {
@@ -176,7 +177,7 @@ class PolygonComponent extends ShapeComponent {
       }
       _cachedGlobalVertices.updateCache<dynamic>(
         _globalVertices,
-        <dynamic>[position.clone(), scale.clone(), angle],
+        <dynamic>[position.clone(), size.clone(), scale.clone(), angle],
       );
     }
     return _cachedGlobalVertices.value!;

packages/flame/test/collisions/collision_callback_test.dart

@@ -315,12 +315,7 @@ void main() {
     },
   );
 
-  // Reproduces #1478, it creates many blocks lined up on the diagonal with one
-  // empty space (one block-unit) between them. Then it moves another block so
-  // that it starts colliding with one of the blocks, but for some reason the
-  // collision is deemed to end in the same tick as it starts, which shouldn't
-  // be possible. If you change the amount of blocks that are generated, this
-  // will happen on different blocks (even though the blocks haven't moved).
+  // Reproduced #1478
   withCollidables.test(
     'collision callbacks with many hitboxes added',
     (game) async {
@@ -343,31 +338,6 @@ void main() {
       }
       await game.ensureAddAll(blocks);
 
-      // All
-      // amount = 33 - 2 bad
-      // 10: [200.0,210.0]
-      // 21: [420.0,430.0]
-
-      // amount = 100 - 6 bad
-      // 10: [200.0,210.0]
-      // 21: [420.0,430.0]
-      // 33: [660.0,670.0]
-      // 66: [1320.0,1330.0]
-      // 77: [1540.0,1550.0]
-      // 88: [1760.0,1770.0]
-
-      // amount = 1000 - 80 bad
-      // 11: [220.0,230.0]
-      // 24: [480.0,490.0]
-      // 36: [720.0,730.0]
-      // 49: [980.0,990.0]
-      // 60: [1200.0,1210.0]
-      // ...
-      // 949: [18980.0,18990.0]
-      // 962: [19240.0,19250.0]
-      // 974: [19480.0,19490.0]
-      // 987: [19740.0,19750.0]
-
       for (var i = 0; i < blocks.length; i++) {
         player.position = Vector2.all(-10000);
         game.update(0);
@@ -407,4 +377,37 @@ void main() {
       expect(player.endCounter, 0);
     },
   );
+
+  // Reproduced #1478
+  withCollidables.test(
+    'collision callbacks with changed game size',
+    (game) async {
+      final block = TestBlock(Vector2.all(20), Vector2.all(10))
+        ..anchor = Anchor.center;
+      await game.ensureAddAll([ScreenHitbox(), block]);
+
+      game.update(0);
+      expect(block.startCounter, 0);
+      expect(block.onCollisionCounter, 0);
+      expect(block.endCounter, 0);
+      block.position.x = game.size.x;
+
+      game.update(0);
+      expect(block.startCounter, 1);
+      expect(block.onCollisionCounter, 1);
+      expect(block.endCounter, 0);
+      game.onGameResize(game.size * 2);
+
+      game.update(0);
+      expect(block.startCounter, 1);
+      expect(block.onCollisionCounter, 1);
+      expect(block.endCounter, 1);
+      block.position.y = game.size.y;
+
+      game.update(0);
+      expect(block.startCounter, 2);
+      expect(block.onCollisionCounter, 2);
+      expect(block.endCounter, 1);
+    },
+  );
 }