[kaddressbook] [Bug 405152] New: Copy/Paste local contact in KAddressBook breaks data in ~/.local/share/contacts/

[Helmar Gerloni]

https://bugs.kde.org/show_bug.cgi?id=405152

            Bug ID: 405152
           Summary: Copy/Paste local contact in KAddressBook breaks data
                    in ~/.local/share/contacts/
           Product: kaddressbook
           Version: GIT
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: helmar at gerloni.net
                CC: tokoe at kde.org
  Target Milestone: ---

When copy/pasting a contact in KAddressBook the data in
~/.local/share/contacts/ gets corrupted. Always reproducible in current KDE
Neon (kaddressbook 4:18.12.2+p18.04+git20190228.0023-0) and also on Debian
Buster.

Steps to reproduce:
- Start KAddressBook with empty local address book "Personal Contacts".
- Create one contact in the local "Personal Contacts"
- Contact shows up in
~/.local/share/contacts/113b24d7-6248-48ac-9087-01ca561a2955.vcf.
- Right click on the contact, Copy Contact To -> Personal Contacts.
- Contact now shows up twice in the address book "Personal Contacts" (as
expected), but it still shows up only once in ~/.local/share/contacts/.
- When you modify one of the contacts in KAddressBook, the File
113b24d7-6248-48ac-9087-01ca561a2955.vcf in ~/.local/share/contacts/ is always
overwritten with the last modified contact.
- So while in KAddressBook everything looks as expected (because it uses the
data from the Akonadi cache?) the "real data" in ~/.local/share/contacts/ is
corrupted; one contact is missing.

This may seem like a minor problem, but it gets serious when you copy the
contact missing in ~/.local/share/contacts/ to a DAV server (Nextcloud in my
case).
The contact is not copied, and Akonadi shows the following error (in
~/.xsession-errors):
  org.kde.pim.davresource: DavGroupwareResource::onItemFetched: Failed to parse
item data. 
"https://nextcloud.mydomain.tld/remote.php/dav/addressbooks/users/testuser/contacts/1551900153.R643.vcf"
The error is obvious since the Nextcloud server responds with a 401 "http
unauthorized" error and a "Not Found" html message (the contact does not exist
on the server).
>From now on Akonadi refuses to synchronize any data with the DAV server, also
the calendar is not synchronized any more (by the way this seems to be another
error).
After removing the broken contact from the Nextcloud addressbook in
KAddressBook followed by "akonadictl restart" everything (in Nextcloud) works
again as expected.
The problem with the local contact can simply be fixed by deleting the broken
contact from KAddressBook, but it's quite tricky to find out what really went
wrong when running into this problem. Also when backing up the "real data" in
~/.local/share/contacts/ you do not get all contacts you see in KAddressBook.

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