allow navigating back to the mainpage
this was not possible in the original implementation but we can now easily allow this thanks to the pagestack, which will take care that the page order is still reasonable BUG: 453989
this was not possible in the original implementation but we can now easily allow this thanks to the pagestack, which will take care that the page order is still reasonable BUG: 453989
mentioned in commit 9a2c3c20