[erp5_only_office] use xmla_client in iframe

bt5/erp5_only_office/SkinTemplateItem/portal_skins/erp5_only_office/onlyoffice.gadget.html.html

@@ -72,5 +72,8 @@
 
     <div id="viewport"></div>
 
+    <div data-gadget-url="onlyoffice/xmla_client.html"
+         data-gadget-scope="xmla_client"
+         data-gadget-sandbox="iframe"></div>
 </body>
 </html>
\ No newline at end of file

bt5/erp5_only_office/SkinTemplateItem/portal_skins/erp5_only_office/onlyoffice.gadget.js.js

@@ -657,10 +657,10 @@ DocsAPI.DocEditor.version = function () {
           return loadScript(app_url);
         })
         .push(function () {
-          // declare public gadgets only after configure requirejs
-          // public because xmla_client return not serialized data
-          return g.declareGadget('onlyoffice/xmla_client.html',
-            {scope: 'xmla_client', sandbox: "public"});
+          return g.getDeclaredGadget("xmla_client");
+        })
+        .push(function (xmla_client) {
+          return xmla_client.render();
         })
         .push(undefined, function (error) {
           display_error(g, error);

bt5/erp5_only_office/SkinTemplateItem/portal_skins/erp5_only_office/onlyoffice/xmla_client.js.js

@@ -147,6 +147,9 @@
         cache: {},
         connections: {}
       };
+    })
+    .declareMethod("render", function () {
+      var g = this;
       return g.getRemoteSettings()
         .push(function (settings) {
           return g.setConnectionsSettings(settings);