Backup read manga that are not in library

app/src/main/java/eu/kanade/tachiyomi/data/backup/AbstractBackupManager.kt

@@ -68,6 +68,9 @@ abstract class AbstractBackupManager(protected val context: Context) {
         databaseHelper.getFavoriteMangas().executeAsBlocking()
 
     // SY -->
+    protected fun getReadManga(): List<Manga> =
+        databaseHelper.getReadNotInLibraryMangas().executeAsBlocking()
+
     /**
      * Returns list containing merged manga that are possibly not in the library
      *

app/src/main/java/eu/kanade/tachiyomi/data/backup/full/FullBackupManager.kt

@@ -67,7 +67,7 @@ class FullBackupManager(context: Context) : AbstractBackupManager(context) {
         var backup: Backup? = null
 
         databaseHelper.inTransaction {
-            val databaseManga = getFavoriteManga() /* SY --> */ + getMergedManga().filterNot { it.source == MERGED_SOURCE_ID } /* SY <-- */
+            val databaseManga = getFavoriteManga() /* SY --> */ + getReadManga() + getMergedManga().filterNot { it.source == MERGED_SOURCE_ID } /* SY <-- */
 
             backup = Backup(
                 backupManga(databaseManga, flags),

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt

@@ -79,6 +79,15 @@ interface MangaQueries : DbProvider {
         .prepare()
 
     // SY -->
+    fun getReadNotInLibraryMangas() = db.get()
+        .listOfObjects(Manga::class.java)
+        .withQuery(
+            RawQuery.builder()
+                .query(getReadMangaNotInLibraryQuery())
+                .build()
+        )
+        .prepare()
+
     fun updateMangaInfo(manga: Manga) = db.put()
         .`object`(manga)
         .withPutResolver(MangaInfoPutResolver())

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt

@@ -61,6 +61,18 @@ fun getMergedChaptersQuery() =
     ON ${Chapter.TABLE}.${Chapter.COL_MANGA_ID} = M.${Merged.COL_MANGA_ID}
 """
 
+/**
+ * Query to get manga that are not in library, but have read chapters
+ */
+fun getReadMangaNotInLibraryQuery() =
+    """
+    SELECT ${Manga.TABLE}.* 
+    FROM ${Manga.TABLE} 
+    WHERE ${Manga.COL_FAVORITE} = 0 AND ${Manga.COL_ID} IN(
+        SELECT ${Chapter.TABLE}.${Chapter.COL_MANGA_ID} FROM ${Chapter.TABLE} WHERE ${Chapter.COL_READ} = 1
+    )
+"""
+
 /**
  * Query to get the manga from the library, with their categories and unread count.
  */