Reordering Drag & Drop via menu keeps the sort order when adding new manga

app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/CategoryTypeMapping.kt

@@ -41,8 +41,12 @@ class CategoryPutResolver : DefaultPutResolver<Category>() {
         put(COL_NAME, obj.name)
         put(COL_ORDER, obj.order)
         put(COL_FLAGS, obj.flags)
+        if (obj.mangaSort != null)
+            put(COL_MANGA_ORDER, obj.mangaSort.toString())
+        else {
             val orderString = obj.mangaOrder.joinToString("/")
             put(COL_MANGA_ORDER, orderString)
+        }
 
     }
 }
@@ -56,6 +60,11 @@ class CategoryGetResolver : DefaultGetResolver<Category>() {
         flags = cursor.getInt(cursor.getColumnIndex(COL_FLAGS))
 
         val orderString = cursor.getString(cursor.getColumnIndex(COL_MANGA_ORDER))
+        if (orderString.firstOrNull()?.isLetter() == true) {
+            mangaSort = orderString.first()
+            mangaOrder = emptyList()
+        }
+        else
             mangaOrder = orderString?.split("/")?.mapNotNull { it.toLongOrNull() } ?: emptyList()
     }
 }

app/src/main/java/eu/kanade/tachiyomi/data/database/models/Category.kt

@@ -14,6 +14,8 @@ interface Category : Serializable {
 
     var mangaOrder:List<Long>
 
+    var mangaSort:Char?
+
     val nameLower: String
         get() = name.toLowerCase()
 

app/src/main/java/eu/kanade/tachiyomi/data/database/models/CategoryImpl.kt

@@ -12,6 +12,8 @@ class CategoryImpl : Category {
 
     override var mangaOrder: List<Long> = emptyList()
 
+    override var mangaSort: Char? = null
+
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other == null || javaClass != other.javaClass) return false

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

@@ -13,6 +13,7 @@ import eu.davidea.flexibleadapter.SelectableAdapter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
 import eu.kanade.tachiyomi.data.database.models.Category
+import eu.kanade.tachiyomi.data.database.models.LibraryManga
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.library.LibraryUpdateService
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
@@ -45,6 +46,7 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
      */
     private lateinit var controller: LibraryController
 
+    private val db: DatabaseHelper by injectLazy()
     /**
      * Category for this view.
      */
@@ -162,6 +164,9 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
                         items.removeAll(selectedManga)
                         if (it.second == 5) items.addAll(0, selectedManga)
                         else items.addAll(selectedManga)
+                        adapter.setItems(items)
+                        adapter.notifyDataSetChanged()
+                        saveDragSort()
                     }
                     else {
                         items = when (it.second) {
@@ -173,10 +178,14 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
                             else -> adapter.currentItems.sortedBy { it.manga.title }
                         }
                         if (it.second % 2 == 0) items = items.reversed()
-                    }
                         adapter.setItems(items)
                         adapter.notifyDataSetChanged()
-                    saveDragSort()
+                        category.mangaSort = ('a' + (it.second - 1))
+                        if (category.name == "Default")
+                            preferences.defaultMangaOrder().set(category.mangaSort.toString())
+                        else
+                            db.insertCategory(category).asRxObservable().subscribe()
+                    }
                 }
             }
     }
@@ -212,13 +221,9 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
         val sortingMode = preferences.librarySortingMode().getOrDefault()
         adapter.isLongPressDragEnabled = canDrag()
         var mangaForCategory = event.getMangaForCategory(category).orEmpty()
-        if (sortingMode == LibrarySort.DRAG_AND_DROP) {
+        if (sortingMode == LibrarySort.DRAG_AND_DROP)
-            if (category.name == "Default")
+            mangaForCategory = sortMangaInDragAnDrop(mangaForCategory)
-                category.mangaOrder = preferences.defaultMangaOrder().getOrDefault().split("/")
+
-                    .mapNotNull { it.toLongOrNull() }
-            mangaForCategory = mangaForCategory.sortedBy { category.mangaOrder.indexOf(it.manga
-                .id) }
-        }
         // Update the category with its manga.
         adapter.setItems(mangaForCategory)
 
@@ -233,6 +238,32 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
         }
     }
 
+    fun sortMangaInDragAnDrop(mangaForCategory: List<LibraryItem>): List<LibraryItem> {
+        if (category.name == "Default") {
+            val defOrder = preferences.defaultMangaOrder().getOrDefault()
+            if (defOrder.first().isLetter()) category.mangaSort = defOrder.first()
+            else category.mangaOrder = defOrder.split("/").mapNotNull { it.toLongOrNull() }
+        }
+        return if (category.mangaSort != null) {
+            var mangas = when (category.mangaSort) {
+                'a', 'b' -> mangaForCategory.sortedBy {
+                    if (preferences.removeArticles().getOrDefault()) it.manga.title.removeArticles()
+                    else it.manga.title
+                }
+                'c', 'd' -> mangaForCategory.sortedBy { it.manga.last_update }
+                else -> mangaForCategory.sortedBy { it.manga.title }
+            }
+            if (category.mangaSort == 'b' || category.mangaSort == 'd')
+                mangas = mangas.asReversed()
+            mangas
+
+        } else mangaForCategory.sortedBy {
+            category.mangaOrder.indexOf(
+                it.manga.id
+            )
+        }
+    }
+
     /**
      * Subscribe to [LibrarySelectionEvent]. When an event is received, it updates the selection
      * depending on the type of event received.
@@ -336,8 +367,8 @@ class LibraryCategoryView @JvmOverloads constructor(context: Context, attrs: Att
 
     private fun saveDragSort() {
         val mangaIds = adapter.currentItems.mapNotNull { it.manga.id }
+        category.mangaSort = null
         category.mangaOrder = mangaIds
-        val db: DatabaseHelper by injectLazy()
         if (category.name == "Default")
             preferences.defaultMangaOrder().set(mangaIds.joinToString("/"))
         else