This adds a text input in UserPage when viewing the current user in a joined room. It allows the user to set their own display name for that room only. This is usually known in other clients as the command /myroomnick.

Type: add

BUG: https://iron.lily-is.land/T117

Open my own user page in a joined room. Input something in the display name text box on the page. Click on Save. Verify that my name in the room is changed. Verify my name in other rooms are not affected.

Open someone else's user page in a joined room. Verify that there is only one text box for name (name overrides) on the page.

Open my own user page in an invited or left room. Verify that such text box does not appear.