[Akonadi] [Bug 403115] New: Some remote ical files cause a high CPU load and freeze

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https://bugs.kde.org/show_bug.cgi?id=403115

            Bug ID: 403115
           Summary: Some remote ical files cause a high CPU load and
                    freeze
           Product: Akonadi
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: ICal file resource
          Assignee: kdepim-bugs at kde.org
          Reporter: spiollinux at googlemail.com
  Target Milestone: ---

Just for reference as the korganizer side to this Akonadi/kcalcore bug: 384309

Adding certain remote ical files as a calendar in korganizer using "Add
Calendar -> iCal Calendar" causes a high CPU load of >~ in the korganizer
process.

But in the end Akonadi/kcalcore is at least a part of the problem, as setting
that resource to "offline" in Akonadi-Console makes the problem go away.

STEPS TO REPRODUCE
1. add a new ical calendar by pasting the following URL into the file field of
"Add Calendar -> iCal Calendar File":
https://unichor-dresden.de/index.php?option=com_chor&task=default.openCalendar&id=2
2. close KOrganizer
3. maybe `akoadictl restart` (optional)
4. re-open korganizer

OBSERVED RESULT

high CPU load and frozen UI of korganizer

EXPECTED RESULT

after a short import time, the program should run fluently with less CPU load

SOFTWARE/OS VERSIONS
Linux: NixOS 18.09
KDE Plasma Version: 5.13.4
KDE Frameworks Version: 5.49.0
Qt Version: 5.11.1

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