[kmail2] [Bug 458160] New: kmail renders calendar invites with a large delay

[Erik Quaeghebeur]

https://bugs.kde.org/show_bug.cgi?id=458160

            Bug ID: 458160
           Summary: kmail renders calendar invites with a large delay
           Product: kmail2
           Version: 5.20.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: bugs.kde.org at e3q.eu
  Target Milestone: ---

SUMMARY
When opening mails containing a calendar invite (multipart/alternative with
parts text/plain, text/html, and text/calendar), kmail nicely formats them,
with buttons for invitation response actions. However, it takes a long time for
these messages to be rendered, i.e., the time between opening them and seeing
anything but white is long (23 seconds on a very fast laptop), which makes the
feature inconvenient.

STEPS TO REPRODUCE
1. Open calendar invite mail

OBSERVED RESULT
See blank space for a long time

EXPECTED RESULT
See rendered invite almost immediately

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.96.0
KDE Frameworks Version: 5.96.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION

In my logs, I see the following right after opening the calendar invite mail. I
assume that this activity is related to the fact that a list of nearby events
are shown at the bottom of the invite mail. I assume that something going wrong
here is what causes the large delay.

akonadiserver[1617]: org.kde.pim.akonadiserver.search: Executing search
"kmail2-3636980645-SearchSession"
akonadiserver[1617]: org.kde.pim.akonadiserver.search: Search 
"kmail2-3636980645-SearchSession" done (without remote search)
akonadiserver[1617]: org.kde.pim.akonadiserver: ItemRetrievalJob for request
511 finished
akonadiserver[1617]: org.kde.pim.akonadiserver: ItemRetrievalJob for request
512 finished
kmail[2754]: parse error from icalcomponent_new_from_string. string= ""
kmail[2754]: org.kde.pim.calendar_serializer: Failed to parse incidence! Item
id =  323784 Storage collection id  209 parentCollectionId =  -4134
kmail[2754]: org.kde.pim.calendar_serializer: ""
kmail[2754]: org.kde.pim.akonadicore: Unable to deserialize payload part:
"RFC822" in item 323784 collection -4134
kmail[2754]: org.kde.pim.akonadicore:  payload data was:  ""
[LAST 5 LINES REPEATED 9 TIMES FOR DIFFERENT ‘items’ AND TWO DIFFERENT
‘collections’]
akonadiserver[1617]: org.kde.pim.akonadiserver: ItemRetrievalJob for request
515 finished
akonadiserver[1617]: org.kde.pim.akonadiserver: ItemRetrievalJob for request
514 finished
kmail[2754]: org.kde.pim.akonadicalendar: Discarding event with invalid
DTSTART. identifier= "bcf67360-f30a-47c5-b40c-7ea81db35e6a_KABC_Birthday" ;
summary= "Verjaardag van <a contact>"
kmail[2754]: org.kde.pim.akonadicalendar: Discarding event with invalid
DTSTART. identifier= "15f9ece3-7d43-4705-b29d-7ae65ce45c60_KABC_Birthday" ;
summary= "Verjaardag van <another contact>"
kmail[2754]: kf.calendarcore: hierarchy loop between 
"5a0b7b9c-81ad-456f-bfdc-6b8c285c356e"  and 
"9884a435-85fd-435d-b300-367cfb2968bb"
[LAST LINE REPEATED 10 TIMES FOR DIFFERENT PAIRS OF UUIDS]
kmail[2754]: org.kde.pim.akonadicalendar: Unable to fetch incidences: "Invalid
item or payload: 308122"
[LAST LINE REPEATED 236 TIMES FOR DIFFERENT ‘items’]
kmail[2754]: org.kde.pim.text_calendar: Unable to fetch incidences: "Invalid
item or payload: 313658"
kmail[2754]: kf.xmlgui: Index  86  is not within range (0 -  20 )

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