Revert "Temporarily revert some things for stable release"

This reverts commit b88f8ae9d2.

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

@@ -5,6 +5,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.IBinder
 import android.os.PowerManager
+import android.widget.Toast
 import androidx.core.content.ContextCompat
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.cache.CoverCache
@@ -40,6 +41,7 @@ import eu.kanade.tachiyomi.util.system.acquireWakeLock
 import eu.kanade.tachiyomi.util.system.createFileInCacheDir
 import eu.kanade.tachiyomi.util.system.isServiceRunning
 import eu.kanade.tachiyomi.util.system.logcat
+import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -277,9 +279,8 @@ class LibraryUpdateService(
             .groupBy { it.source }
             .filterKeys { sourceManager.get(it) !is UnmeteredSource }
             .maxOfOrNull { it.value.size } ?: 0
-        // TODO: re-enable warning
         if (maxUpdatesFromSource > MANGA_PER_SOURCE_QUEUE_WARNING_THRESHOLD) {
-//            toast(R.string.notification_size_warning, Toast.LENGTH_LONG)
+            toast(R.string.notification_size_warning, Toast.LENGTH_LONG)
         }
     }