fix(replay): stop a platform view mask spilling past its visible bounds

.changeset/platform-view-mask-spill.md

@@ -0,0 +1,5 @@
+---
+'posthog_flutter': patch
+---
+
+Fix session replay painting a clipped map, WebView, or camera preview past its visible edge and over the widgets around it. A platform view's mask now covers only the part an ancestor clip leaves visible, and a revealed one is clipped to the same region, so widgets a platform view used to bury are visible in replays again

example/lib/main.dart

@@ -8,6 +8,7 @@ import 'package:posthog_flutter_example/error_example.dart';
 
 import 'exception_steps_screen.dart';
 import 'masking_tests_screen.dart';
+import 'platform_view_spill_screen.dart';
 import 'platform_views_screen.dart';
 import 'survey_nested_navigator_screen.dart';
 
@@ -219,6 +220,25 @@ class InitialScreenState extends State<InitialScreen> {
                   },
                   child: const Text('Platform Views (Replay)'),
                 ),
+                const SizedBox(height: 8),
+                ElevatedButton(
+                  style: ElevatedButton.styleFrom(
+                    backgroundColor: Colors.deepPurple,
+                    foregroundColor: Colors.white,
+                  ),
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (context) => const PlatformViewSpillScreen(),
+                        settings: const RouteSettings(
+                          name: 'platform_view_spill',
+                        ),
+                      ),
+                    );
+                  },
+                  child: const Text('Platform View Spill (Replay)'),
+                ),
                 const Padding(
                   padding: EdgeInsets.all(8.0),
                   child: Text(