Redirect to absolute url of respective Web Section so if 'Renderer ID' is set...

Redirect to absolute url of respective Web Section so if 'Renderer ID' is set (as usually when a web section is used for forum) the UI displays iforum UI which is not the case when default 'view' of Web Section is used if we redirect to using form_id.
As thread is show immediately correct message to not confuse users.

bt5/erp5_discussion/SkinTemplateItem/portal_skins/erp5_discussion/WebSection_createNewDiscussionThread.xml

@@ -124,7 +124,7 @@ discussion_post = discussion_thread.newContent(\n
                       language = language)\n
 \n
 # depending on security model Thread and Post can be directly published or shared\n
-portal_status_message = "New discussion created in background."\n
+portal_status_message = "New discussion thread created."\n
 discussion_thread.publish()\n
 \n
 # handle attachments\n
@@ -177,7 +177,7 @@ if send_notification_text not in (\'\', None):\n
         message_text_format=notification_message.getContentType(),\n
         store_as_event=False)\n
 \n
-return context.Base_redirect(form_id,\n
+return context.Base_redirect(redirect_url=context.absolute_url(),\n
          keep_items = dict(portal_status_message=context.Base_translateString(portal_status_message),\n
                            thread_relative_url=discussion_thread.getRelativeUrl()))\n
 </string> </value>

bt5/erp5_discussion/bt/revision

-149
+150
\ No newline at end of file