adjust so downloader doesnt autostart when queue was paused (#2413)

adjust so downloader doesnt autostart when queue was paused

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -199,7 +199,7 @@ class Downloader(
      */
     fun queueChapters(manga: Manga, chapters: List<Chapter>, autoStart: Boolean) = launchUI {
         val source = sourceManager.get(manga.source) as? HttpSource ?: return@launchUI
-
+        val wasEmpty = queue.isEmpty()
         // Called in background thread, the operation can be slow with SAF.
         val chaptersWithoutDir = async {
             val mangaDir = provider.findMangaDir(manga, source)
@@ -232,7 +232,7 @@ class Downloader(
             }
 
             // Start downloader if needed
-            if (autoStart) {
+            if (autoStart && wasEmpty) {
                 DownloadService.start([email protected])
             }
         }