Allow page "move" to the same page after a change in the name strategy

See https://forum.xwiki.org/t/slug-in-page-url/7076/6?u=pdwalker for a full explanation

Summary: if you change the name strategy, you cannot "move" the page to a new url without changing the title.  And if you wish to keep the old title, you'll have to do a second rename.  

This could potentially also create unnecessary redirects.

Edit: I am not sure which component this belongs but it relates to this:
https://extensions.xwiki.org/xwiki/bin/view/Extension/Name Strategies Module/