@Override
  public @NotNull FileFilter getRootFilter(@NotNull BuildRootDescriptor descriptor) {
    FileFilter filter = myFileFilters.get(descriptor);
    if (filter == null) {
      filter = descriptor.createFileFilter();
      myFileFilters.put(descriptor, filter);
    }
    return filter;
  }
@Override
  public @NotNull FileFilter getRootFilter(@NotNull BuildRootDescriptor descriptor)