[kontact] [Bug 419780] New: Completion status of a recurring task does not sync correctly to NextCloud

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=419780

            Bug ID: 419780
           Summary: Completion status of a recurring task does not sync
                    correctly to NextCloud
           Product: kontact
           Version: 5.11.3
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: todo
          Assignee: kdepim-bugs at kde.org
          Reporter: mail+kdebugs at thomasborowski.de
  Target Milestone: ---

SUMMARY

When completing an instance of a recurring task in Kontact, Kontact updates the
task's due date to the next date according to the task's recurrence settings.
This status however does not sync to NextCloud, i. e. the task in NextCloud
remains unchanged.

When completing the task on an Android phone in the Tasks app
(https://tasks.org/), the app creates a new occurence according to the task's
recurrence settings. The task syncs correctly to Thunderbird Lightning, but in
Kontact the start and due dates of the task are off by several days.  After
restarting Kontact, the task's due date corresponds to the task's settings, but
is displayed incorrectly in the task list (actual due date is shown in start
date column, due date column shows date two days after start date).

STEPS TO REPRODUCE
1. Create a new to do item in Kontact on a NextCloud calendar with the start
date set to current date/time (filled automatically) and the due date set to
some time in the future. Set the recurrence to Daily / every 1 day / never
ends.
2. Wait for the task to sync to NextCloud and validate the task's settings on
another device, e. g. an Android phone.
3. In the list of to do items in Kontact, click the checkbox of the item that
you just created to mark this instance as complete.
4. Wait for the task to sync (as described above, this might never happen).
5. Mark the task as completed on another device, e. g. an Android phone, and
wait for the task to sync.
6. Check/validate the updated task's settings in Thunderbird Lightning and
Kontact.

OBSERVED RESULT

The start and due dates of the completed task gets incremented in Kontact as
per the task's recurrence settings. However, the task in NextCloud does not get
updated accordingly, i. e. it retains its uncompleted status and original start
and due dates. When marking the task as completed on the other device
(Android), the updated task syncs correctly to NextCloud and has the correct
updated due date in Thunderbird Lightning. In Kontact, however, the task shows
seemingly random start and due dates several days in the future. After
restarting Kontact, the task has the correct new due date, but shows an
incorrect due date in the task list (actual due date is shown in start date
column, due date column shows start date + 2 days).

EXPECTED RESULT

After completing the task, the corresponding task in NextCloud should reflect
the new start and due dates. Completing the task on any device should result in
the task having the new due date set according to its recurrence settings.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 19.10
(available in About System)
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4

ADDITIONAL INFORMATION

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