private boolean _addToRecompiled(BuildRootDescriptor root, Collection<? extends File> filesToAdd) {
    Set<File> files = myFilesToRecompile.get(root);
    if (files == null) {
      files = FileCollectionFactory.createCanonicalFileLinkedSet();
      myFilesToRecompile.put(root, files);
    }
    return files.addAll(filesToAdd);
  }
private boolean _addToRecompiled(BuildRootDescriptor root, Collection<? extends File> filesToAdd)