Method OnClosing

src/main.cpp:198–206

  }

  void OnClosing(rex::ui::UIEvent& e) override {
    (void)e;
    REXLOG_INFO("Window closing, shutting down...");
    shutting_down_.store(true, std::memory_order_release);
    if (runtime_ && runtime_->kernel_state()) {
      runtime_->kernel_state()->TerminateTitle();
    }
    app_context().QuitFromUIThread();
  }

  void OnDestroy() override {
    settings_overlay_.reset();