disable windows thread merging

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

windows/runner/main.cpp

@@ -26,6 +26,9 @@ int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
 
   flutter::DartProject project(L"data");
 
+  // https://github.com/flutter/flutter/issues/175135
+  project.set_ui_thread_policy(flutter::UIThreadPolicy::RunOnSeparateThread);
+
   std::vector<std::string> command_line_arguments =
       GetCommandLineArguments();