mapToSingle
inline fun <P : AnyPanel> LiveData<out Collection<AnyPanel>>.mapToSingle(): LiveData<P?>
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Maps a collection containing all AnyPanels of all Frontends to a single Panel of type P. This mapping assumes there cannot be multiple instances of type P and will throw an IllegalStateException if it does encounter multiple ones.
If no AnyPanel of type P is present in the collection, null will be returned.