fix checkbox icon update, add unique check on async tasks

src/app.cpp

@@ -27,14 +27,14 @@ void destroy_window();
 
 App* App::I = nullptr; // singleton
 
-std::deque<std::packaged_task<void()>> App::render_tasklist;
+std::deque<AppTask> App::render_tasklist;
 std::mutex App::render_task_mutex;
 std::condition_variable App::render_cv;
 std::thread App::render_thread;
 std::thread::id App::render_thread_id;
 bool App::render_running = false;
 
-std::deque<std::packaged_task<void()>> App::ui_tasklist;
+std::deque<AppTask> App::ui_tasklist;
 std::mutex App::ui_task_mutex;
 std::condition_variable App::ui_cv;
 std::thread App::ui_thread;
@@ -425,28 +425,6 @@ void App::async_start()
 #endif
 }
 
-void App::async_update()
-{
-#if __IOS__
-    [ios_view->glview bindDrawable];
-#elif _WIN32
-    glBindFramebuffer(GL_FRAMEBUFFER, 0);
-#endif
-    redraw = true;
-    clear();
-    update(0);
-#if __OSX__
-    [osx_view async_swap];
-#elif __IOS__
-    [ios_view->glview bindDrawable];
-    [ios_view async_swap];
-#elif __ANDROID__
-    android_async_swap(and_engine);
-#elif _WIN32
-    async_swap();
-#endif
-}
-
 void App::async_redraw()
 {
     redraw = true;
@@ -822,7 +800,7 @@ void App::render_thread_main()
     render_running = true;
     while (render_running)
     {
-        std::deque<std::packaged_task<void()>> working_list;
+        std::deque<AppTask> working_list;
 
         // move the task list locally to free the queue for other threads
         {
@@ -838,6 +816,7 @@ void App::render_thread_main()
             while (!working_list.empty())
             {
                 //LOG("render task %d", count);
+                //LOG("task %s", working_list.front().name.c_str());
                 count++;
                 working_list.front()();
                 working_list.pop_front();
@@ -867,7 +846,7 @@ void App::ui_thread_main()
     int rendered_frames = 0;
     while (ui_running)
     {
-        std::deque<std::packaged_task<void()>> working_list;
+        std::deque<AppTask> working_list;
 
         // move the task list locally to free the queue for other threads
         {