I've finally managed to reproduce this. It requires 2 launchpad accounts. Steps are:
1. Log in to wiki with account 1
2. Log out of wiki
3. Change username of account in LP to something else.
4. Log out of LP
5. Log in to LP with account 2
6. Change username of account 2 to the original username of account 1
7. Log in to wiki with account 2
Result: "The username you have chosen is already taken. If it is your username, enter your password below to associate the username with your OpenID. Otherwise, please choose a different username and leave the password field blank."
Moin assumes you have a password on your wiki account, but it's never been set because we use only OpenID on wiki.u.c. Next step is to figure out how to fix for our users.
I've finally managed to reproduce this. It requires 2 launchpad accounts. Steps are:
1. Log in to wiki with account 1
2. Log out of wiki
3. Change username of account in LP to something else.
4. Log out of LP
5. Log in to LP with account 2
6. Change username of account 2 to the original username of account 1
7. Log in to wiki with account 2
Result: "The username you have chosen is already taken. If it is your username, enter your password below to associate the username with your OpenID. Otherwise, please choose a different username and leave the password field blank."
Moin assumes you have a password on your wiki account, but it's never been set because we use only OpenID on wiki.u.c. Next step is to figure out how to fix for our users.