The row numbers in items hold only while the playlist keeps this version.
Number of entries in items.
Selected rows, in playlist order.
Index of the playlist.
Unique identifier of the playlist, formatted as {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}. Pass as playlistGuid to reliably target this playlist.
Always true here; a failed call resolves with ApiFailure instead.
Successful response from
playlist.getSelection.