fixed playTrackAt when double clicking track

backend/playbackcommands.go

@@ -25,6 +25,7 @@ const (
 	// arg2: InsertMode
 	// arg3: bool (shuffle)
 	cmdLoadItems
+	cmdLoadItemsAndPlayAtIdx
 	cmdSetQueueState
 	cmdLoadRadioStation // arg: *mediaprovider.RadioStation, arg2: InsertQueueMode
 
@@ -161,6 +162,18 @@ func (c *playbackCommandQueue) LoadItems(items []mediaprovider.MediaItem, insert
 	c.cmdAvailable.Signal()
 }
 
+func (c *playbackCommandQueue) LoadItemsAndPlayAtIdx(items []mediaprovider.MediaItem, shuffle bool, idx int) {
+	c.mutex.Lock()
+	c.queue = append(c.queue, playbackCommand{
+		Type: cmdLoadItemsAndPlayAtIdx,
+		Arg:  items,
+		Arg2: shuffle,
+		Arg3: idx,
+	})
+	c.mutex.Unlock()
+	c.cmdAvailable.Signal()
+}
+
 func (c *playbackCommandQueue) SetQueueState(tracks []*mediaprovider.Track, queueType QueueType) {
 	c.mutex.Lock()
 	c.queue = append(c.queue, playbackCommand{

backend/playbackengine.go

@@ -371,16 +371,7 @@ func (p *playbackEngine) SetShuffle(shuffle bool) {
 
 	newNowPlayingIdx := 0
 	if shuffle {
-		shuffledQueue := deepCopyMediaItemSlice(p.playQueue)
-		rand.Shuffle(len(shuffledQueue), func(i, j int) {
-			shuffledQueue[i], shuffledQueue[j] = shuffledQueue[j], shuffledQueue[i]
-		})
-		if p.nowPlayingIdx >= 0 && len(p.getPlayQueue()) > p.nowPlayingIdx {
-			nowPlayingID := p.getPlayQueue()[p.nowPlayingIdx].Metadata().ID
-			p.setShuffledPlayQueue(sharedutil.ReorderItems(shuffledQueue, []int{p.GetTrackIdxByIdFrom(shuffledQueue, nowPlayingID)}, 0))
-		} else {
-			return
-		}
+		p.LoadItemsAndPlayAtIdx(p.playQueue, true, p.nowPlayingIdx)
 	} else {
 		if p.nowPlayingIdx >= 0 && len(p.getShuffledPlayQueue()) > p.nowPlayingIdx {
 			nowPlayingID := p.getShuffledPlayQueue()[p.nowPlayingIdx].Metadata().ID
@@ -515,6 +506,32 @@ func (p *playbackEngine) LoadItems(items []mediaprovider.MediaItem, insertQueueM
 	return p.doLoaditems(newItems, insertQueueMode, shuffle)
 }
 
+// Load items into the play queue.
+// If replacing the current queue (!appendToQueue), playback will be stopped.
+func (p *playbackEngine) LoadItemsAndPlayAtIdx(items []mediaprovider.MediaItem, shuffle bool, idx int) error {
+	newItems := deepCopyMediaItemSlice(items)
+
+	if p.shuffle || shuffle {
+		rand.Shuffle(len(newItems), func(i, j int) {
+			newItems[i], newItems[j] = newItems[j], newItems[i]
+		})
+		if idx < len(items) {
+			nowPlayingID := items[idx].Metadata().ID
+			p.setPlayQueue(deepCopyMediaItemSlice(items))
+			p.setShuffledPlayQueue(sharedutil.ReorderItems(newItems, []int{p.GetTrackIdxByIdFrom(newItems, nowPlayingID)}, 0))
+			p.PlayTrackAt(0)
+		}
+	} else {
+		p.doLoaditems(newItems, Replace, shuffle)
+		p.PlayTrackAt(idx)
+	}
+
+	p.handleNextTrackUpdated()
+	p.invokeNoArgCallbacks(p.onQueueChange)
+
+	return nil
+}
+
 // Load tracks into the play queue.
 // If replacing the current queue (!appendToQueue), playback will be stopped.
 func (p *playbackEngine) LoadTracks(tracks []*mediaprovider.Track, insertQueueMode InsertQueueMode, shuffle bool) error {

backend/playbackmanager.go

@@ -399,6 +399,12 @@ func (p *PlaybackManager) LoadTracks(tracks []*mediaprovider.Track, insertQueueM
 	p.cmdQueue.LoadItems(items, insertQueueMode, shuffle)
 }
 
+// Replaces the playQueue with tracks and moves the track at idx to position 0
+func (p *PlaybackManager) LoadTracksAndPlayAtIdx(tracks []*mediaprovider.Track, shuffle bool, idx int) {
+	items := sharedutil.CopyTrackSliceToMediaItemSlice(tracks)
+	p.cmdQueue.LoadItemsAndPlayAtIdx(items, shuffle, idx)
+}
+
 // Load items into the currently active queue. (shuffledPlayQueue/playQueue)
 // If replacing the current queue (!appendToQueue), playback will be stopped.
 // Loading items into the shuffledPlayQueue may also modify the playQueue
@@ -871,6 +877,13 @@ func (p *PlaybackManager) runCmdQueue(ctx context.Context) {
 					c.Arg3.(bool),
 				)
 				logIfErr("LoadItems", err)
+			case cmdLoadItemsAndPlayAtIdx:
+				err := p.engine.LoadItemsAndPlayAtIdx(
+					c.Arg.([]mediaprovider.MediaItem),
+					c.Arg2.(bool),
+					c.Arg3.(int),
+				)
+				logIfErr("LoadItemsAndPlayAtIdx", err)
 			case cmdSetQueueState:
 				err := p.engine.SetQueueState(
 					c.Arg.([]*mediaprovider.Track),