Section renaming using "Section Properties" button causes one more section to be created

1. Go to Front-End in "Content Mode" and use "Section Properties" button (on top).
2. Change section name, so filename will be change too.
3. You end up on newly created page inside page you edited and named as old page name and created by "Guest" user.

This all happens because old page url is stored in opener_stack and when page url is changed, then opener_stack is not updated.

New page is created by Guest user (current user on Front-End) in case, when administrator visits url of page, that doesn't exist. I doubt, that such functionality is required at all.