Count early, late and backdated releases when predicting next update

app/src/main/java/eu/kanade/domain/chapter/interactor/SyncChaptersWithSource.kt

@@ -226,11 +226,18 @@ class SyncChaptersWithSource(
             updated = updatedChapters,
         )
 
+        val excludedScanlators = getExcludedScanlators.await(manga.id).toHashSet()
+
+        // A first fetch lists the back catalogue, and chapters coming back under a deleted number were out already
+        val foundRelease = dbChapters.isNotEmpty() &&
+            toAdd.any { chapter ->
+                chapter.scanlator !in excludedScanlators &&
+                    !(chapter.isRecognizedNumber && chapter.chapterNumber in deletedChapterNumbers)
+            }
+
         // Set this manga as updated since chapters were changed
         // Note that last_update actually represents last time the chapter list changed at all
-        updateManga.awaitUpdateFetchIntervalAndLastUpdate(manga, timeZone, now, fetchWindow)
-
-        val excludedScanlators = getExcludedScanlators.await(manga.id).toHashSet()
+        updateManga.awaitUpdateFetchIntervalAndLastUpdate(manga, timeZone, now, fetchWindow, foundRelease)
 
         return added.filterNot { it.url in changedOrDuplicateReadUrls || it.scanlator in excludedScanlators }
     }

app/src/main/java/eu/kanade/domain/manga/interactor/UpdateManga.kt

@@ -44,9 +44,10 @@ class UpdateManga(
         timeZone: TimeZone,
         dateTime: LocalDateTime,
         window: ClosedRange<Instant>?,
+        foundRelease: Boolean,
     ): Boolean {
         return mangaRepository.update(
-            fetchInterval.withFetchInterval(manga, dateTime, timeZone, window).apply {
+            fetchInterval.withFetchInterval(manga, dateTime, timeZone, window, foundRelease).apply {
                 lastUpdate = Clock.System.now()
             },
         )