Please describe the problem:
When subscribing to a CalDav calendar when there is an @ symbol in the username (which is very common), the connection fails and the URI field is scrambled in a pseudorandom fashion.


Steps to reproduce:
1. Add a new calendar
2. Select CalDav as the Calendar Type, enter a Name, and then enter the URI of your CalDav server.  I used "http://mail.local", my test CalDav server
3. In the username field, enter a username including an @ symbol.  I used "carol@infoglobe.ca"
4. Click OK, and then enable the tickbox next to the calendar you just created in the calendar list.
5. Enter the credentials, and wait for the box to become unticked again.
6. Right click the calendar and select Properties.

What I entered:
http://orospakr.ca/stuff/caldav_at_entry_time.png

Actual results:


What I saw after I tried connecting:
http://orospakr.ca/stuff/caldav_afterwards.png


Expected results:
The calendar should load, and the account settings in the Calendar Properties screen should not change.

Does this happen every time?
It appears to, however the URI string is permutated differently every attempt I attempt to recreate the CalDav account.

An example: 
caldav://infoglobe.ca@infoglobe.c@infoglobe.@infoglobe@infoglob@infoglo@infogloe@infoglo@infogl@infog@info@inf@in@i@@mail.local

Other information: