Real name system - an edge case which causes infinite redirection

Problem to solve

Resolving the infinite redirection issue

Steps to reproduce.

1. Turn off real_name_system feature flag.
2. Register a new user (but not login yet)
3. Turn on real_name_system feature flag.
4. Login to the application.
5. Observe

What happened

The page will be redirected from /users/new/welcome to /users/terms, back and forth. Thus creates a infinite redirection loop.

Proposal