message: send fallback in pre tags, not code
diff: @@ -53,9 +53,9 @@ export function htmlSerializeIfNeeded(model: EditorModel, {forceHTML = false} =
  md = md.replace(reg, function(match, p1) {
  const p1e = AllHtmlEntities.encode(p1);
  if (d.display == true) {
  - return `<div data-mx-maths="${p1e}"><code>${p1e}</code></div>`;
  + return `<div data-mx-maths="${p1e}"><pre>${p1e}</pre></div>`;
  } else {
  - return `<span data-mx-maths="${p1e}"><code>${p1e}</code></span>`;
  + return `<span data-mx-maths="${p1e}"><pre>${p1e}</pre></span>`;
  }
  });
  });
  