render implement thread, wrap GL commands into tasks

src/app_dialogs.cpp

@@ -28,7 +28,6 @@ std::shared_ptr<NodeProgressBar> App::show_progress(const std::string& title)
 
 NodeMessageBox* App::message_box(const std::string &title, const std::string& text, bool cancel_button)
 {
-    async_start();
     auto* m = layout[main_id]->add_child<NodeMessageBox>();
     m->m_title->set_text(title.c_str());
     m->m_message->set_text(text.c_str());
@@ -36,8 +35,6 @@ NodeMessageBox* App::message_box(const std::string &title, const std::string& te
     if (!cancel_button)
         m->btn_cancel->destroy();
     layout[main_id]->update();
-    async_redraw();
-    async_end();
     return m;
 }
 
@@ -80,7 +77,6 @@ void App::dialog_about()
 void App::dialog_newdoc()
 {
     auto show_dialog = [this] {
-        async_start();
         auto dialog = std::make_shared<NodeDialogNewDoc>();
         dialog->m_manager = &layout;
         dialog->init();
@@ -153,7 +149,6 @@ void App::dialog_newdoc()
             dialog->destroy();
             App::I.hideKeyboard();
         };
-        async_end();
     };
 
     if (canvas)
@@ -190,7 +185,6 @@ void App::dialog_newdoc()
 void App::dialog_open()
 {
     auto show_dialog = [this] {
-        async_start();
         // load thumbnail test
         auto dialog = std::make_shared<NodeDialogOpen>();
         dialog->m_manager = &layout;
@@ -217,7 +211,6 @@ void App::dialog_open()
 //            dialog->destroy();
 //            ActionManager::clear();
         };
-        async_end();
     };
 
     if (canvas)
@@ -253,7 +246,6 @@ void App::dialog_open()
 void App::dialog_browse()
 {
     auto show_dialog = [this] {
-        async_start();
         // load thumbnail test
         auto dialog = std::make_shared<NodeDialogBrowse>();
         dialog->m_manager = &layout;
@@ -277,7 +269,6 @@ void App::dialog_browse()
                 dialog->destroy();
             }
         };
-        async_end();
     };
 
     if (canvas)