Redirect to home page should force its own stack

[sdumetz]

What happens ?

When the home page has no category and leads to a page with a category (through a link), if this page links back to something with no category it will pop back to the home page's stack and scroll to the requested page.

What should happen ?

The home page should probably always be on its own stack level to always be able to hit return after navigating to somewhere else.