coverArt

The open item's own cover picture, or null when it carries none, until the player has read it, and once nothing is open (#425). The media session shows it on the lock screen and in the notification when the application gives no picture of its own.

Its own flow rather than a field on state, because a picture is large, and every consumer of the snapshot would otherwise compare it on every change. It is read once per item, from the bytes the file already holds, and nothing is decoded for it.