message: Fix multiline paragraph rendering as single line
diff: @@ -56,6 +56,12 @@ function isAllowedHtmlTag(node: commonmark.Node): boolean {
  function isMultiLine(node: commonmark.Node): boolean {
  let par = node;
  while (par.parent) {
  + // commonmark Parser separate quotes with blank quoted lines between them with
  + // paragraphs, so we need to consider it when the markdown is only a multiline quote.
  + if (par.type === 'block_quote') {
  + break;
  + }
  +
  par = par.parent;
  }
  return par.firstChild != par.lastChild;
  