private static void indentLines(final @NotNull Document document,
                                  final int startLine, final int endLine, final @NotNull CharSequence indentString) {
    Runnable indentTask = () -> {
      for (int line = startLine; line <= endLine; line++) {
        int lineStartOffset = document.getLineStartOffset(line);
        document.insertString(lineStartOffset, indentString);
      }
    };
    DocumentUtil.executeInBulk(document, endLine - startLine > LINE_LIMIT_FOR_BULK_CHANGE, indentTask);
  }
private static void indentLines(final @NotNull Document document,
                                  final int startLine, final int endLine, final @NotNull CharSequence indentString)