message: display user-defined control sequence as is
diff: @@ -132,7 +132,7 @@ export class Viewer {
  useGlobalCache: false
  },
  TeX: {
  - extensions: ["AMSmath.js", "AMSsymbols.js", "autoload-all.js"]
  + extensions: ["AMSmath.js", "AMSsymbols.js", "noUndefined.js", "autoload-all.js"]
  },
  tex2jax: {
  inlineMath: [ ['\$','\$'], ['\\\\(', '\\\\)'] ]
  