disable workaround for previews validity

--in the past in order for previews to be valid
we had to hide and reshow previews after each
current task changing. As it appears this might
not be needed any more, let's try to disable it.

plasmoid/package/contents/ui/main.qml

@@ -573,9 +573,10 @@ Item {
 
                 //! Workaround in order to update properly the previews thumbnails
                 //! when switching between single thumbnail to another single thumbnail
-                mainItem.visible = false;
+                //! maybe is not needed any more, let's disable it
+                //mainItem.visible = false;
                 visible = true;
-                mainItem.visible = true;
+                //mainItem.visible = true;
             }
         }
     }