Asynchronously copies or moves messages from one folder to another.
If the this or destination folders have the same parent store, this may be more efficient
than using append_message.
When the operation is finished, callback will be called. You can then call transfer_messages_to.end
to get the result of the operation.
| this |
the source Folder |
| message_uids |
message UIDs in this |
| destination |
the destination Folder |
| delete_originals |
whether or not to delete the original messages |
| io_priority |
the I/O priority of the request |
| cancellable |
optional Cancellable object, or null |
| callback |
a TaskReadyCallback to call when the request is satisfied |
| user_data |
data to pass to the callback function |