Add a small note to a TODO.

utils/pub/io.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Helper functionality to make working with IO easier.
 library io;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:json';
@@ skipping 254 matching lines @@
       stackTrace = localStackTrace;
     }
 
     var children = [];
     lister.onError = (error) => completer.completeException(error, stackTrace);
     lister.onDir = (file) {
       if (!includeHiddenFiles && basename(file).startsWith('.')) return;
       file = join(dir, basename(file));
       contents.add(file);
 
-      // TODO(nweiz): don't manually recurse once issue 7358 is fixed.
+      // TODO(nweiz): don't manually recurse once issue 7358 is fixed. Note that
+      // once we remove the manual recursion, we'll need to explicitly filter
+      // out files in hidden directories.
       if (recursive) {
         children.add(doList(new Directory(file), listedDirectories));
       }
     };
     lister.onFile = (file) {
       if (!includeHiddenFiles && basename(file).startsWith('.')) return;
       contents.add(join(dir, basename(file)));
     };
 
     return completer.future.chain((contents) {
@@ skipping 683 matching lines @@
 Directory _getDirectory(entry) {
   if (entry is Directory) return entry;
   return new Directory(entry);
 }
 
 /// Gets a [Uri] for [uri], which can either already be one, or be a [String].
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }