On org.mpris.MediaPlayer2.Player: method updateMetadata(in a{sv} updatedEntries) - to delete an entry, send an invalid variant property as editableMetadataEntries - list of metadata entry names that can be edited Similar things on org.mpris.MediaPlayer2.TrackList.
Looking at this again, I don't think invalid variants can be sent over D-Bus, so some other method of deleting needs to be thought of. Maybe updateMetadata(in a{sv} updatedEntries, in as deletedEntries) We should also note that updatedEntries can contain new entries, but the media player is not obligated to accept them, although it should generally accept anything in editableMetadataEntries (which may be more things than in Metadata).
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