add glad to load OpenGL extensions

src/node_dialog_cloud.cpp

@@ -141,6 +141,8 @@ void NodeDialogCloud::load_thumbs_thread()
             auto image_tex = node->find<NodeImageTexture>("thumb-tex");
             image_tex->tex.destroy();
             image_tex->tex.create(thumb);
+
+            app_redraw();
         }
         curl_easy_cleanup(curl);
     }