Ensure correct server URLs with .well-known and server type

[jryans]

Fixes element-hq/element-web#8346 where the combo of .well-known discovery and switching server types led to a split brain situation where the UI mentioned two different HSes, so you didn't know for sure where you'd actually sign in.

This also flattens the server URLs in the login flow so we don't store so many different kinds (entered vs. discovered). Instead, there's a single place the URLs always flow towards as they change, which should be less confusing.

[turt2live]

it's not immediately obvious to me how all the different URL flags work together, but this does look like the right thing from what I can tell.

[Cadair]

I am not a fan of how this means you can't just type your mxid and password into the boxes and not click anything else. The best bit about .well-known for me was there was one set of instructions for users for all possible homeservers. It was "login with your full mxid and password" and Riot will "do the right thing". Now it's dependant upon the homeserver again ☹️

[jryans]

I am not a fan of how this means you can't just type your mxid and password into the boxes and not click anything else. The best bit about .well-known for me was there was one set of instructions for users for all possible homeservers. It was "login with your full mxid and password" and Riot will "do the right thing". Now it's dependant upon the homeserver again ☹️

I am not sure I follow the exact step you dislike here... It's also easily possible there is a bug or oversight.

I think it would help if you file a new issue describing what seems wrong with the new approach in more detail.

[Cadair]

Thanks @jryans have done 😄