While starting kontact:
EventViews::AgendaView::Private::calendarIncidenceChanged: AgendaView::calendarIncidenceChanged() Invalid agendaItem for incidence "17libkcal-1037779684.52"
These are probably triggered by dataChanged signals from the ETM calendar (that we now emit more frequently).
The error message should be harmless, but we should avoid it to avoid confusing testers.