Pass list instead of iterable

lib/utils/file_util.dart

@@ -76,8 +76,11 @@ Future<void> deleteFilesFromEverywhere(
   }
   if (hasUploadedFiles) {
     for (final collectionID in updatedCollectionIDs) {
-      Bus.instance.fire(CollectionUpdatedEvent(collectionID,
-          deletedFiles.where((file) => file.collectionID == collectionID)));
+      Bus.instance.fire(CollectionUpdatedEvent(
+          collectionID,
+          deletedFiles
+              .where((file) => file.collectionID == collectionID)
+              .toList()));
     }
     // TODO: Blocking call?
     SyncService.instance.deleteFilesOnServer();