gitlab.gnome.org "log in using gitlab" login failure

If a user has created a gitlab login on gitlab.gnome.org, the "log in with gitlab" fails using the login credentials from gitlab.com with a 422 error message: "email already in use".

This makes some sense if you remember that you've created an account before on gitlab.gnome.org, but at this point the user has not entered in an email address to log in, so the message "email already in use" makes no sense to the user who is trying to log in.

Recommend changing the error message to: "Log in with github.com credentials failed - You already have an account set up on gitlab.gnome.com using email youremail@yourhost.xxx" "Please log in with those credentials instead. If you've forgotten them, [click here]."

This provides a better explanation of the issue behind the error, and tells the user that they can not log in with gitlab.com (saving them the hassle of trying again).

I have been told to post this bug report here by csoriano from #gnome irc channel and av from the #sysadmin irc channel.

Thanks for your attention.