Add reindex downloads description

Closes #8546
Also disable sound for the notification and cancel running indexing job if invalidating.

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsAdvancedScreen.kt

@@ -191,6 +191,7 @@ class SettingsAdvancedScreen : SearchableSettings {
                 ),
                 Preference.PreferenceItem.TextPreference(
                     title = stringResource(R.string.pref_invalidate_download_cache),
+                    subtitle = stringResource(R.string.pref_invalidate_download_cache_summary),
                     onClick = { Injekt.get<DownloadCache>().invalidateCache() },
                 ),
                 Preference.PreferenceItem.TextPreference(

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -222,6 +222,7 @@ class DownloadCache(
 
     fun invalidateCache() {
         lastRenew = 0L
+        renewalJob?.cancel()
     }
 
     /**
@@ -242,7 +243,6 @@ class DownloadCache(
         }
 
         renewalJob = scope.launchIO {
-            try {
             notifier.onCacheProgress()
 
             var sources = getSources()
@@ -302,10 +302,8 @@ class DownloadCache(
 
             lastRenew = System.currentTimeMillis()
             notifyChanges()
-            } finally {
-                notifier.dismissCacheProgress()
-            }
         }
+        renewalJob?.invokeOnCompletion { notifier.dismissCacheProgress() }
     }
 
     private fun getSources(): List<Source> {

app/src/main/java/eu/kanade/tachiyomi/data/notification/Notifications.kt

@@ -159,6 +159,7 @@ object Notifications {
                     setName(context.getString(R.string.channel_downloader_cache))
                     setGroup(GROUP_DOWNLOADER)
                     setShowBadge(false)
+                    setSound(null, null)
                 },
                 buildNotificationChannel(CHANNEL_BACKUP_RESTORE_PROGRESS, IMPORTANCE_LOW) {
                     setName(context.getString(R.string.channel_progress))

i18n/src/main/res/values/strings.xml

@@ -505,6 +505,7 @@
     <string name="cache_delete_error">Error occurred while clearing</string>
     <string name="pref_auto_clear_chapter_cache">Clear chapter cache on app close</string>
     <string name="pref_invalidate_download_cache">Invalidate downloads index</string>
+    <string name="pref_invalidate_download_cache_summary">Force app to recheck downloaded chapters</string>
     <string name="pref_clear_database">Clear database</string>
     <string name="pref_clear_database_summary">Delete history for entries that are not saved in your library</string>
     <string name="clear_database_source_item_count">%1$d non-library entries in database</string>