Steps to reproduce

1. Having two sites
   1. One of this site should have virtual pages (like ODF root or user directory root)-
2. Go to the other site on CMS side
3. Create a new redirect page
4. You have the following options in the dropdown, it includes pages from the other site and virtual pages (from the other site too) :
   
5. If you open the tree, you only have the pages of the site-, but you are still able to select virtual pages if you have on your current site-.

Maybe it's OK to have pages of the other site, but it's weird that we cannot select it through the tree.
Also, I don't think virutal pages should be selectable because their ids change.
And we should have a better presentation in the drop down, we don't even know from which site is each page. There is no structure.