[erp5_web_renderjs_ui] Use a document fragment to build the page content

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_launcher_js.js

@@ -461,12 +461,10 @@
           .push(function (main_gadget) {
             // Append loaded gadget in the page
             if (main_gadget !== undefined) {
-              return main_gadget.getElement()
-                .push(function (fragment) {
               var element = gadget.props.content_element,
-                    content_container = document.createElement("div");
-                  content_container.className = "ui-content " +
-                    (gadget.props.sub_header_class || "");
+                content_container = document.createDocumentFragment();
+              // content_container.className = "ui-content " +
+              //   (gadget.props.sub_header_class || "");
               // reset subheader indicator
               delete gadget.props.sub_header_class;
 
@@ -477,13 +475,12 @@
               while (element.firstChild) {
                 element.removeChild(element.firstChild);
               }
-                  content_container.appendChild(fragment);
+              content_container.appendChild(main_gadget.element);
               element.appendChild(content_container);
 
               return updateHeader(gadget);
               // XXX Drop notification
               // return header_gadget.notifyLoaded();
-                });
             }
           });
       }