[Bug 1846423]

[Hungerburg]

Probably of interest: The X-LIC-ERROR line is not in the ics exported
from the caldav server, but it is in the ics exported from lightning. I
suppose that it only marks, that lightning got a parsing error in one of
the preceding lines. Plus: it seems to always be about a TRIGGER.

Here to the spec, https://icalendar.org/iCalendar-RFC-5545/3-8-6-3-trigger.html
- TRIGGER;VALUE=DURATION:-PT10M looks legit, it is a relative alarm

The ;VALUE=DURATION part is optional though. TRIGGER:-PT10M would do as
well. Probably the ics parser just does not like it spelt out in full.

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https://bugs.launchpad.net/bugs/1846423

Title:
  Lightning: Cannot dismiss reminders. Got a VALUE parameter with an
  illegal type for property: VALUE=DURATION

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