Better UX for the lowercase username requirement on registration

[patricksavalle]

Your use case

What would you like to do?

Remove confusion around lowercase username

Why would you like to do it?

While on-boarding 10 communities on their own homeservers, I noticed this is a big hurdle for many. Either the warning message is unclear or the requirement is unexpected.

How would you like to achieve it?

Just lowercase the name, don't warn, don't ask. Or issue a more specific warning message.

Have you considered any alternatives?

No response

Additional context

No response

[BurnyBoi]

Just forcing it lowercase makes sense. Every email registration form ever already does this.

[HarHarLinks]

Just forcing it lower case doesn't work as long as legacy usernames with upper case are supported, does it?
There would need to be some kind of migration for these legacy mxids in synapse. Unless I'm unaware of something like that already existing.

When this can be enforced, the input field should instantly convert any upper case letters to lower case, or not let you input upper case in the first place.

[t3chguy]

There would need to be some kind of migration for these legacy mxids in synapse. Unless I'm unaware of something like that already existing.

Which isn't possible as MXIDs are immutably burned into all the events you've ever sent.

[HarHarLinks]

Oh wow okay I'm mixing things up here. I was linked to this issue from an issue about the Log In screen, but this is only about Registration.

For registration you can and should naturally just lowercase new MXIDs.

Please ignore my other comment that's related to logging in.