fix: watch position not set for downloaded videos

app/src/main/java/com/github/libretube/services/AbstractPlayerService.kt

@@ -5,6 +5,7 @@ import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.view.KeyEvent
+import androidx.annotation.CallSuper
 import androidx.annotation.OptIn
 import androidx.core.app.ServiceCompat
 import androidx.core.os.bundleOf
@@ -51,7 +52,8 @@ abstract class AbstractPlayerService : MediaLibraryService(), MediaLibrarySessio
     lateinit var videoId: String
         private set
 
-    var isTransitioning = true
+    var isTransitioning = false
+        private set
 
     val handler = Handler(Looper.getMainLooper())
 
@@ -88,6 +90,14 @@ abstract class AbstractPlayerService : MediaLibraryService(), MediaLibrarySessio
                 )
             }
         }
+
+        override fun onPlaybackStateChanged(playbackState: Int) {
+            super.onPlaybackStateChanged(playbackState)
+
+            if (playbackState == Player.STATE_READY) {
+                isTransitioning = false
+            }
+        }
     }
 
     override fun onCustomCommand(
@@ -311,7 +321,10 @@ abstract class AbstractPlayerService : MediaLibraryService(), MediaLibrarySessio
      *
      * This function should base its actions on the videoId variable.
      */
-    abstract suspend fun startPlayback()
+    @CallSuper
+    open suspend fun startPlayback() {
+        isTransitioning = true
+    }
 
     private fun saveWatchPosition() {
         if (isTransitioning || !watchPositionsEnabled) return

app/src/main/java/com/github/libretube/services/OfflinePlayerService.kt

@@ -90,6 +90,8 @@ open class OfflinePlayerService : AbstractPlayerService() {
      * Attempt to start an audio player with the given download items
      */
     override suspend fun startPlayback() {
+        super.startPlayback()
+
         val downloadWithItems = withContext(Dispatchers.IO) {
             Database.downloadDao().findById(videoId)
         }!!

app/src/main/java/com/github/libretube/services/OnlinePlayerService.kt

@@ -77,8 +77,6 @@ open class OnlinePlayerService : AbstractPlayerService() {
 
                 Player.STATE_BUFFERING -> {}
                 Player.STATE_READY -> {
-                    isTransitioning = false
-
                     // save video to watch history when the video starts playing or is being resumed
                     // waiting for the player to be ready since the video can't be claimed to be watched
                     // while it did not yet start actually, but did buffer only so far
@@ -113,11 +111,11 @@ open class OnlinePlayerService : AbstractPlayerService() {
     }
 
     override suspend fun startPlayback() {
+        super.startPlayback()
+
         val timestamp = startTimestamp ?: 0L
         startTimestamp = null
 
-        isTransitioning = true
-
         streams = withContext(Dispatchers.IO) {
             try {
                 StreamsExtractor.extractStreams(videoId)