Sort library by download count

app/src/main/java/eu/kanade/presentation/library/LibrarySettingsDialog.kt

@@ -177,6 +177,7 @@ private fun ColumnScope.SortPage(
         MR.strings.action_sort_latest_chapter to LibrarySort.Type.LatestChapter,
         MR.strings.action_sort_chapter_fetch_date to LibrarySort.Type.ChapterFetchDate,
         MR.strings.action_sort_date_added to LibrarySort.Type.DateAdded,
+        MR.strings.action_sort_download_count to LibrarySort.Type.DownloadCount,
     ).plus(trackerSortOption).map { (titleRes, mode) ->
         SortItem(
             label = stringResource(titleRes),

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryScreenModel.kt

@@ -312,6 +312,9 @@ class LibraryScreenModel(
                     val item2Score = trackerScores[i2.libraryManga.id] ?: defaultTrackerScoreSortValue
                     item1Score.compareTo(item2Score)
                 }
+                LibrarySort.Type.DownloadCount -> {
+                    i1.downloadCount.compareTo(i2.downloadCount)
+                }
             }
         }