message: Use Qt candidate window on Wayland.
diff: @@ -242,10 +242,14 @@ CandidateWindowHandlerInterface *createGtkCandidateWindowHandler(
  if (!absl::GetFlag(FLAGS_use_mozc_renderer)) {
  return nullptr;
  }
  +
  +#ifndef ENABLE_QT_RENDERER
  if (GetEnv("XDG_SESSION_TYPE") == "wayland") {
  // mozc_renderer is not supported on wayland session.
  return nullptr;
  }
  +#endif // !ENABLE_QT_RENDERER
  +
  auto *handler = new GtkCandidateWindowHandler(renderer_client);
  handler->RegisterGSettingsObserver();
  return handler;
  