@Nullable
  @Override
  public String getHint(@NotNull QuickFix fix) {
    if (fix instanceof RemoveUnusedLibrary && ((RemoveUnusedLibrary)fix).myFiles == null) {
      return ((RemoveUnusedLibrary)fix).myLibraryName;
    }
    return null;
  }
@Nullable
  @Override
  public String getHint(@NotNull QuickFix fix)