Fix hot restart flake (#122776)

Author: Anna Gringauze

packages/flutter_tools/lib/src/vmservice.dart

@@ -1019,7 +1019,10 @@ class FlutterVmService {
         onError: (Object? error, StackTrace stackTrace) {
           if (error is vm_service.SentinelException ||
             error == null ||
-            (error is vm_service.RPCError && error.code == RPCErrorCodes.kServiceDisappeared)) {
+            error is vm_service.RPCError &&
+              (error.code == RPCErrorCodes.kServiceDisappeared ||
+                error.code == RPCErrorCodes.kInternalError &&
+                error.message.contains('Sentinel kind: Collected'))) {
             return null;
           }
           return Future<vm_service.Isolate?>.error(error, stackTrace);

packages/flutter_tools/test/web.shard/hot_reload_web_test.dart

@@ -45,6 +45,20 @@ Future<void> _testProject(HotReloadProject project, {String name = 'Default'}) a
     await flutter.hotRestart();
   });
 
+  testWithoutContext('$testName: hot restart works without error after delay', () async {
+    flutter.stdout.listen(printOnFailure);
+    await flutter.run(chrome: true, additionalCommandArgs: <String>['--verbose', '--web-renderer=html']);
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    await flutter.hotRestart();
+  });
+
+  testWithoutContext('$testName: multiple hot restarts work without error', () async {
+    flutter.stdout.listen(printOnFailure);
+    await flutter.run(chrome: true, additionalCommandArgs: <String>['--verbose', '--web-renderer=html']);
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    await Future.wait(<Future<void>>[ flutter.hotRestart(), flutter.hotRestart()]);
+  });
+
   testWithoutContext('$testName: newly added code executes during hot restart', () async {
     final Completer<void> completer = Completer<void>();
     final StreamSubscription<String> subscription = flutter.stdout.listen((String line) {