flutter: Catcher: Only enable on Android or iOS

src/ui/flutter_app/lib/main.dart

@@ -34,6 +34,11 @@ import 'widgets/main_menu.dart';
 //import 'package:sentry_flutter/sentry_flutter.dart';
 
 Future<void> main() async {
+  if (!(Platform.isAndroid || Platform.isIOS)) {
+    runApp(SanmillApp());
+    return;
+  }
+
   var catcher = Catcher(rootWidget: SanmillApp(), ensureInitialized: true);
 
   //DateTime now = DateTime.now();

src/ui/flutter_app/windows/runner/flutter_window.cpp

@@ -53,15 +53,19 @@ bool FlutterWindow::OnCreate() {
   }
   RegisterPlugins(flutter_controller_->engine());
 
-  engine = new MillEngine();
-  auto channel = std::make_unique<flutter::MethodChannel<>>(
-      flutter_controller_->engine()->messenger(), "com.calcitem.sanmill/engine",
-      &flutter::StandardMethodCodec::GetInstance());
-  channel->SetMethodCallHandler(
-      [this](const auto &call, auto result) {
-          HandleMethodCall(call, std::move(result));
-      }
-  );
+  if (engine == nullptr) {
+      engine = new MillEngine();
+
+      auto channel = std::make_unique<flutter::MethodChannel<>>(
+          flutter_controller_->engine()->messenger(), "com.calcitem.sanmill/engine",
+          &flutter::StandardMethodCodec::GetInstance());
+
+      channel->SetMethodCallHandler(
+          [this](const auto &call, auto result) {
+              HandleMethodCall(call, std::move(result));
+          }
+      );
+  }
 
   run_loop_->RegisterFlutterInstance(flutter_controller_->engine());
   SetChildContent(flutter_controller_->view()->GetNativeWindow());

src/ui/flutter_app/windows/runner/mill_engine.cpp

@@ -38,7 +38,7 @@ extern "C" {
 EngineState state = EngineState::STATE_READY;
 pthread_t thread_id = nullptr;
 
-void *engineThread(void *)
+DWORD WINAPI engineThread(LPVOID lpParam)
 {
     printf("Engine Think Thread enter.\n");
 
@@ -46,7 +46,7 @@ void *engineThread(void *)
 
     printf("Engine Think Thread exit.\n");
 
-    return nullptr;
+    return 0;
 }
 
 int MillEngine::startup()