Index shuffling of SNS below handle fails when there are nodes with different names between the SNS

Result : Preview in cms fails when :

@QA: for testing for archetype created website

1) Adding a new document with name containing for example spaces : This introduces a hippo:translation node
2) Edit doc, save it and publish it
3) Edit the doc again, change and save it
4) Go to preview in channel mngr: Not found
5) publish doc again
6) edit doc again and save
7) now preview goes fine: Reason: the hippo:translation node has moved to the top resulting in SNS being all grouped together

After fix Frank the above scenario should always work