After checking again today, I noticed the official PPA has Thunderbird
78.8.1, and the issue is thus fixed. Therefore, this bug can be closed.
** Changed in: thunderbird (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1925677
Title:
Thunderbird: Recurring tasks on CalDAV account can no longer be set to
completed
Status in thunderbird package in Ubuntu:
Fix Released
Bug description:
Steps to reproduce:
Set up calendar and tasks with a CalDav server and an old Thunderbird
version (up to ca. December 2020).
Set up a recurring task.
Whenever an instance of the recurring task becomes due, mark it as
completed.
Repeat this for a few instances.
Upgrade to Thunderbird 78.7.1.
Examine the list of tasks.
Actual results:
Previous instances of the recurring tasks (which had already been
marked as completed before the update) now reappear and show as
incomplete. If I manually set them to Completed, the status will be
reset upon sync.
Expected results:
Completion status (as previously set) is honored and the tasks no
longer show as open.
Additional information:
The server is running DAViCal.
I just ran a few extra tests:
* Recurring tasks in local storage (create a weekly task, starting a few
weeks in the past and ending a few weeks into the future, then mark some of the
past instances as complete)
* Same on the CalDAV calendar, sync after marking a few past instances
complete
* Repeat the CalDAV tests with variations: complete the second instance but
leave the first one uncompleted; complete the third instance, sync, then
complete the second one
* Non-recurring task on CalDAV
Results:
* Non-recurring tasks are not affected; I can mark the task completed and it
will keep its status.
* Recurring tasks in local storage are also not affected; completed instances
will keep their status.
* Instances of recurring tasks on CalDAV can be marked completed but will
lose their status upon synchronization. Exception: one instance maintains its
completion status.
* The instance to maintain its completion status is the first one that got
marked complete (i.e. based on the time the completion flag got set, not based
on start date).
This bug began showing with an update deployed sometime between
January–March 2021, though I failed to record the exact version
numbers.
I also have an Android app accessing the same DAViCal instance, where
the completed instance have not been reset.
In conclusion, the issue seems to occur when reading tasks from a
CalDAV server (tasks on the server are not altered). The first
instance which got set to Completed retains its completion status,
whereas the flag is ignored for all later ones.
I have filed this bug upstream at
https://bugzilla.mozilla.org/show_bug.cgi?id=1707032 and was told that
this issue should be fixed as of Thunderbird 78.8.0 (current being
78.10.0). So the main issue is that the Ubuntu repos have an outdated
Thunderbird version with a known issue.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: thunderbird 1:78.7.1+build1-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-72.80-generic 5.4.101
Uname: Linux 5.4.0-72-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BuildID: 20210203182138
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Thu Apr 22 22:31:01 2021
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-12-09 (2325 days ago)
InstallationMedia: Ubuntu MATE 14.10 "Utopic Unicorn" - amd64 (20141023)
SourcePackage: thunderbird
UpgradeStatus: Upgraded to focal on 2020-11-17 (156 days ago)
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