WebDAVDiscover: Compare normalized URIs
I create a WebDAV-only collection account for the user firstname.lastname@example.org with any password.
Because this user has no Scheduling Inbox, and when only one calendar-home-set is returned Thunderbird insists that the user has Scheduling Inbox, if it has Scheduling Outbox, this user has two calendar-home-sets. Having two calendar-home-sets is anyway valid.
Then I open the WebDAV editor. It shows each calendar-home-set twice - some are initially collapsed, some not.