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Before this, we couldn't rename users from "CoolDude" into "cooldude" because we did the check case insensitively. If we carelessly allowed it, then someone could be renamed into "Adelikat" when "adelikat" already exists.
This PR changes this so that both cases are now properly handled. The critical line is
.Where(userName => userName == oldUserName || userName == newUserName)
We ourselves don't check anything with letter case, and instead we let the DB do everything. We use it to check for both the old user name and the new one, and if the DB finds 2 different people, then we can't rename.
Also there are unit tests. :D