Reset queue index on end

With this change the queue index will always reset to -1 (INDEX_NONE) once the last item in the queue ends instead of leaving the last queue item active. This solves various issues in the UI (like the screensaver) where it keeps showing the last item when nothing is playing

playback/core/src/main/kotlin/queue/QueueService.kt

@@ -54,7 +54,8 @@ class QueueService internal constructor() : PlayerService(), Queue {
 			override fun onVideoSizeChange(width: Int, height: Int) = Unit
 			override fun onMediaStreamEnd(mediaStream: PlayableMediaStream) {
 				coroutineScope.launch {
-					next(usePlaybackOrder = true, useRepeatMode = true)
+					val nextItem = next(usePlaybackOrder = true, useRepeatMode = true)
+					if (nextItem == null && _entryIndex.value != Queue.INDEX_NONE) setIndex(Queue.INDEX_NONE, true)
 				}
 			}
 		})
@@ -91,7 +92,7 @@ class QueueService internal constructor() : PlayerService(), Queue {
 		}
 
 		// Return item or null if not found
-		return if (index < fetchedItems.size) fetchedItems[index]
+		return if (index >= 0 && index < fetchedItems.size) fetchedItems[index]
 		else null
 	}
 
@@ -144,7 +145,7 @@ class QueueService internal constructor() : PlayerService(), Queue {
 	}
 
 	override suspend fun setIndex(index: Int, saveHistory: Boolean): QueueEntry? {
-		if (index < 0) return null
+		if (index < 0 && index != Queue.INDEX_NONE) return null
 
 		// Save previous index
 		if (saveHistory && _entryIndex.value != Queue.INDEX_NONE) {