Create thumbnails only when the tab is not focused

www/code/inner.js

@@ -348,13 +348,11 @@ define([
                     getContainer: getThumbnailContainer,
                     filter: function (el, before) {
                         if (before) {
-                            // Overflow visible to the parents makes it look better but
-                            // it creates chaos in the editbale area
-                            //$(el).parents().css('overflow', 'visible');
+                            $(el).parents().css('overflow', 'visible');
                             $(el).css('max-height', Math.max(600, $(el).width()) + 'px');
                             return;
                         }
-                        //$(el).parents().css('overflow', '');
+                        $(el).parents().css('overflow', '');
                         $(el).css('max-height', '');
                     }
                 }