Fix "Add manga to library" snackbar not showing with ChapterDownloadAction.START_NOW (#8271)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -376,8 +376,7 @@ class MangaController : FullComposeController<MangaPresenter> {
                     }
                 }
                 ChapterDownloadAction.START_NOW -> {
-                    val chapterId = items.singleOrNull()?.chapter?.id ?: return@launch
-                    presenter.startDownloadingNow(chapterId)
+                    downloadChapters(items.map { it.chapter }, startNow = true)
                 }
                 ChapterDownloadAction.CANCEL -> {
                     val chapterId = items.singleOrNull()?.chapter?.id ?: return@launch
@@ -390,8 +389,13 @@ class MangaController : FullComposeController<MangaPresenter> {
         }
     }
 
-    private suspend fun downloadChapters(chapters: List<DomainChapter>) {
-        presenter.downloadChapters(chapters)
+    private suspend fun downloadChapters(chapters: List<DomainChapter>, startNow: Boolean = false) {
+        if (startNow) {
+            val chapterId = chapters.singleOrNull()?.id ?: return
+            presenter.startDownloadingNow(chapterId)
+        } else {
+            presenter.downloadChapters(chapters)
+        }
 
         if (!presenter.isFavoritedManga) {
             val result = snackbarHostState.showSnackbar(