fix mac RTL and app termination deadlock

src/app.cpp

@@ -679,6 +679,9 @@ void App::terminate()
 {
     LOG("App::terminate");
     NodeStrokePreview::terminate_renderer();
+    rec_stop();
+    
+    async_start();
     TextureManager::invalidate();
     ShaderManager::invalidate();
     layout.unload();
@@ -693,7 +696,7 @@ void App::terminate()
     floating_color.reset();
     floating_layers.reset();
     floating_picker.reset();
-    rec_stop();
+    async_end();
 }
 
 void App::update_memory_usage(size_t bytes)
@@ -787,7 +790,9 @@ void App::rec_stop()
         rec_cv.notify_all();
         if (rec_thread.joinable())
             rec_thread.join();
+        async_start();
         update_rec_frames();
+        async_end();
     }
 }
 

src/app_layout.cpp

@@ -921,7 +921,7 @@ void App::init_menu_experimental()
                 };
                 rtl_btn->find<NodeCheckBox>("experimental-rtl-check")->on_value_changed = [this, main](Node*, bool checked) 
                 {
-                    auto ui = main->find("ui-root");
+                    auto ui = main->find("central-row");
                     ui->SetRTL(checked ? YGDirectionRTL : YGDirectionLTR);
                 };
             }