Hi,

the enclosed patch fixes a minor issue in gnus-icalendar.

The current version does not allow CANCEL events to be synced to
org. This makes sense if the original event being canceled has no org
entry. But if the user synced to original event to org, it will keep
showing in his agenda even after it has been canceled.

With this patch it is possible to update (=deactivate the org timestamp)
of org appointments for which a CANCEL event is received.