Fix auto-downloading for merged manga

(cherry picked from commit 8f868c0813a9a5e7af64760f22e849cb344a4f89)

# Conflicts:
#	app/src/main/sqldelight/data/merged.sq

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

@@ -25,6 +25,19 @@ fun getMergedMangaQuery() =
     ON ${Manga.TABLE}.${Manga.COL_ID} = M.${Merged.COL_MANGA_ID}
 """
 
+/**
+ * Query to get the manga merged into a merged manga
+ */
+fun getMergedMangaForDownloadingQuery() =
+    """
+    SELECT ${Manga.TABLE}.*
+    FROM (
+        SELECT ${Merged.COL_MANGA_ID} FROM ${Merged.TABLE} WHERE ${Merged.COL_MERGE_ID} = ? AND ${Merged.COL_DOWNLOAD_CHAPTERS} = 1
+    ) AS M
+    JOIN ${Manga.TABLE}
+    ON ${Manga.TABLE}.${Manga.COL_ID} = M.${Merged.COL_MANGA_ID}
+"""
+
 /**
  * Query to get all the manga that are merged into other manga
  */

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -480,13 +480,22 @@ class LibraryUpdateService(
         // We don't want to start downloading while the library is updating, because websites
         // may don't like it and they could ban the user.
         // SY -->
-        val chapterFilter = if (manga.source == MERGED_SOURCE_ID) {
+        if (manga.source == MERGED_SOURCE_ID) {
-            db.getMergedMangaReferences(manga.id!!).executeAsBlocking()
+            val downloadingManga = db.getMergedMangasForDownloading(manga.id!!).executeAsBlocking()
-                .filterNot { it.downloadChapters }
+                .associateBy { it.id!! }
-                .mapNotNull { it.mangaId } + manga.id!!
+            chapters.groupBy { it.manga_id }
-        } else emptyList()
+                .forEach {
+                    downloadManager.downloadChapters(
+                        downloadingManga[it.key] ?: return@forEach,
+                        chapters,
+                        false,
+                    )
+                }
+
+            return
+        }
         // SY <--
-        downloadManager.downloadChapters(manga, /* SY --> */ chapters.filterNot { it.manga_id in chapterFilter } /* SY <-- */, false)
+        downloadManager.downloadChapters(manga, chapters, false)
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/source/online/all/MergedSource.kt

@@ -70,12 +70,12 @@ class MergedSource : HttpSource() {
                 .apply {
                     if (isEmpty()) {
                         throw IllegalArgumentException(
-                            "Manga references are empty, info unavailable, merge is likely corrupted"
+                            "Manga references are empty, info unavailable, merge is likely corrupted",
                         )
                     }
                     if (size == 1 && first().mangaSourceId == MERGED_SOURCE_ID) {
                         throw IllegalArgumentException(
-                            "Manga references contain only the merged reference, merge is likely corrupted"
+                            "Manga references contain only the merged reference, merge is likely corrupted",
                         )
                     }
                 }

app/src/main/java/exh/merged/sql/queries/MergedQueries.kt

@@ -9,6 +9,7 @@ import eu.kanade.tachiyomi.data.database.models.Chapter
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.database.queries.getAllMergedMangaQuery
 import eu.kanade.tachiyomi.data.database.queries.getMergedChaptersQuery
+import eu.kanade.tachiyomi.data.database.queries.getMergedMangaForDownloadingQuery
 import eu.kanade.tachiyomi.data.database.queries.getMergedMangaFromUrlQuery
 import eu.kanade.tachiyomi.data.database.queries.getMergedMangaQuery
 import eu.kanade.tachiyomi.data.database.tables.ChapterTable
@@ -61,6 +62,16 @@ interface MergedQueries : DbProvider {
         )
         .prepare()
 
+    fun getMergedMangasForDownloading(mergedMangaId: Long) = db.get()
+        .listOfObjects(Manga::class.java)
+        .withQuery(
+            RawQuery.builder()
+                .query(getMergedMangaForDownloadingQuery())
+                .args(mergedMangaId)
+                .build(),
+        )
+        .prepare()
+
     fun getMergedMangas(mergedMangaUrl: String) = db.get()
         .listOfObjects(Manga::class.java)
         .withQuery(