Calls the send_objects_sync method on the given backend.
| this |
An ECalBackendSync object. |
| cal |
An EDataCal object. |
| cancellable |
a Cancellable for the operation |
| calobj |
The iCalendar object to send. |
| opflags |
bit-or of OperationFlags |
| users |
List of users to send notifications to. |
| modified_calobj |
Placeholder for the iCalendar object after being modified. |