@Nullable
    @Override
    protected String getMessage() {
      if (myComparisonData.isContentsEqual == ThreeState.UNSURE) return null;
      if (myComparisonData.isContentsEqual == ThreeState.YES) {
        return DiffBundle.message("binary.diff.contents.are.identical.message.text");
      }
      else {
        return DiffBundle.message("binary.diff.contents.are.different.message.text");
      }
    }
@Nullable
    @Override
    protected String getMessage()