Add support to update strategy on global update (#7902)

* Add support to update strategy.

* Add JavaDoc and bump the LIB_VERSION_MAX constant.

* Fix a word typo.

* Store update strategy enum as integer in the DB.

(cherry picked from commit ba533f30ce)

# Conflicts:
#	app/src/main/java/eu/kanade/data/DatabaseAdapter.kt
#	app/src/main/java/eu/kanade/data/manga/MangaMapper.kt
#	app/src/main/java/eu/kanade/data/manga/MangaRepositoryImpl.kt
#	app/src/main/java/eu/kanade/tachiyomi/AppModule.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/backup/models/BackupManga.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/database/models/MangaImpl.kt
#	app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt
#	app/src/main/sqldelight/data/mangas.sq
#	app/src/main/sqldelight/migrations/20.sqm

source-api/src/main/java/eu/kanade/tachiyomi/source/model/SManga.kt

@@ -20,6 +20,8 @@ interface SManga : Serializable {
 
     var thumbnail_url: String?
 
+    var update_strategy: UpdateStrategy
+
     var initialized: Boolean
 
     fun getGenres(): List<String>? {
@@ -65,6 +67,8 @@ interface SManga : Serializable {
 
         status = other.status
 
+        update_strategy = other.update_strategy
+
         if (!initialized) {
             initialized = other.initialized
         }
@@ -81,6 +85,7 @@ interface SManga : Serializable {
         it.status = originalStatus
         // SY <--
         it.thumbnail_url = thumbnail_url
+        it.update_strategy = update_strategy
         it.initialized = initialized
     }
 

source-api/src/main/java/eu/kanade/tachiyomi/source/model/SMangaImpl.kt

@@ -20,6 +20,8 @@ class SMangaImpl : SManga {
 
     override var thumbnail_url: String? = null
 
+    override var update_strategy: UpdateStrategy = UpdateStrategy.ALWAYS_UPDATE
+
     override var initialized: Boolean = false
 
     // SY -->

source-api/src/main/java/eu/kanade/tachiyomi/source/model/UpdateStrategy.kt

@@ -0,0 +1,22 @@
+package eu.kanade.tachiyomi.source.model
+
+/**
+ * Define the update strategy for a single [SManga].
+ * The strategy used will only take effect on the library update.
+ *
+ * @since extensions-lib 1.4
+ */
+enum class UpdateStrategy {
+    /**
+     * Series marked as always update will be included in the library
+     * update if they aren't excluded by additional restrictions.
+     */
+    ALWAYS_UPDATE,
+
+    /**
+     * Series marked as only fetch once will be automatically skipped
+     * during library updates. Useful for cases where the series is previously
+     * known to be finished and have only a single chapter, for example.
+     */
+    ONLY_FETCH_ONCE
+}