Track username changes in invite acceptance links

[barryvan (Barry van Oudtshoorn)]

This remains an ongoing issue. As noted in

Accepted invitation notifications 404 if username is changed

Having just sent out a whole slew of invitations, I’ve seen this happen a few times now. People accept the invitation with one username, but then change their mind. If I then follow the notification link, I get a 404 page. Ideally, this would redirect to the appropriate user’s page. I’ve put this in as a bug because from a UX perspective, it feels buggy – the notification is right there, telling me about this user, but doesn’t work when I click on it. It was put in as a feature request before: …

I would recommend that this be classified as a bug – to the user, it feels as though Discourse has thrown an error when used in the expected fashion. @watchmanmonitor’s suggestion of sending the user to a list of redeemed invites, ordered by recency, would be an appropriate workaround that would resolve the perception that Discourse has broken.