Using the navroot in https://github.com/plone/Products.CMFPlone/commit/359a10d7a22ec842ffd647cc852043fd842c1b8c introduced a bug when the plonesite used VHM:

links to the mail_password_form on login_form contained the portal's path too. eg. plone.org/Plone/mail_password_form

fixed by using navigationRootUrl which respects VHM settings