Don't assume Stable ids for playlist

ultrasonic/src/main/kotlin/org/moire/ultrasonic/adapters/BaseAdapter.kt

@@ -26,7 +26,8 @@ import timber.log.Timber
  * It should be kept generic enough that it can be used a Base for all lists in the app.
  */
 @Suppress("unused", "UNUSED_PARAMETER")
-class BaseAdapter<T : Identifiable> : MultiTypeAdapter(), FastScrollRecyclerView.SectionedAdapter {
+class BaseAdapter<T : Identifiable>(allowDuplicateEntries: Boolean = false) :
+    MultiTypeAdapter(), FastScrollRecyclerView.SectionedAdapter {
 
     // Update the BoundedTreeSet if selection type is changed
     internal var selectionType: SelectionType = SelectionType.MULTIPLE
@@ -41,7 +42,7 @@ class BaseAdapter<T : Identifiable> : MultiTypeAdapter(), FastScrollRecyclerView
     private val diffCallback = GenericDiffCallback<T>()
 
     init {
-        setHasStableIds(true)
+        setHasStableIds(!allowDuplicateEntries)
     }
 
     override fun getItemId(position: Int): Long {

ultrasonic/src/main/kotlin/org/moire/ultrasonic/adapters/TrackViewBinder.kt

@@ -43,14 +43,7 @@ class TrackViewBinder(
     override fun onBindViewHolder(holder: TrackViewHolder, item: Identifiable) {
         val diffAdapter = adapter as BaseAdapter<*>
 
-        val track: Track = when (item) {
-            is Track -> {
-                item
-            }
-            else -> {
-                return
-            }
-        }
+        val track = (item as? Track) ?: return
 
         // Remove observer before binding
         holder.observableChecked.removeObservers(lifecycleOwner)
@@ -59,7 +52,7 @@ class TrackViewBinder(
             song = track,
             checkable = checkable,
             draggable = draggable,
-            diffAdapter.isSelected(item.longId)
+            diffAdapter.isSelected(track.longId)
         )
 
         holder.itemView.setOnLongClickListener {
@@ -110,7 +103,7 @@ class TrackViewBinder(
         diffAdapter.selectionRevision.observe(
             lifecycleOwner
         ) {
-            val newStatus = diffAdapter.isSelected(item.longId)
+            val newStatus = diffAdapter.isSelected(track.longId)
 
             if (newStatus != holder.check.isChecked) holder.check.isChecked = newStatus
         }

ultrasonic/src/main/kotlin/org/moire/ultrasonic/fragment/PlayerFragment.kt

@@ -176,7 +176,7 @@ class PlayerFragment :
     private val binding get() = _binding!!
 
     private val viewAdapter: BaseAdapter<Identifiable> by lazy {
-        BaseAdapter()
+        BaseAdapter(allowDuplicateEntries = true)
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {