Get the type of the last change entry as defined in [enum@GUPnPAV.
CDSLastChangeEvent].
| this |
A [struct@GUPnPAV.CDSLastChangeEntry] |
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An event from the [enum@GUPnPAV.CDSLastChangeEvent] or gupnp_cds_last_change_event_invalid if the entry is not valid. |