private static @NotNull ASTNode normalizeWhiteSpace(PsiWhiteSpace whiteSpace, PsiElement nextElement) {
    String text = whiteSpace.getText();
    int endLPos = text.lastIndexOf('\n');
    if (text.lastIndexOf('\n', endLPos - 1) >= 0) {
      // has at least two line breaks
      return ASTFactory.whitespace(text.substring(endLPos));
    }
    if (nextElement instanceof PsiWhiteSpace && nextElement.getText().contains("\n") && !text.contains("\n")) {
      text = '\n' + text;
    }
    return ASTFactory.whitespace(text);
  }
private static @NotNull ASTNode normalizeWhiteSpace(PsiWhiteSpace whiteSpace, PsiElement nextElement)