The Calendar app needs to access calendars of a given principal in the
back-end. The new calendar providers were not accessible for apps before
this patch. Now they can access the ICalendar objects on demand.
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
Andy Scherzinger
Côme Chilliet
Christoph Wurst
Anna Larch