Invitation link is super counter-intuitive because it's consumed

At the Institut Telecom, we are heavily relying on invitation emails, but we have a big counter-intuitive problem with invitations.

Basically, our users have little clue about the web. As a result, the invitation email becomes THE documentation to come back to the XWiki website. Yet, if the same invitation link is used twiced, the user is thwarted which is really annoying.

Instead, the invitation link should gently redirect the user the login form once consumed, because most likely it's the original user who is just using the invitation email to come back to the wiki.