Can't use markdown-it-mathjax3 plugin because of \n replacement from src attribute

[profanat]

Describe the bug
If you use markdown-it-mathjax3 plugin with q-markdown then you can't use any math expressions starting with \n like \notin because \n is getting replaced. Source code of the replacement https://github.com/quasarframework/quasar-ui-qmarkdown/blob/dev/ui/src/components/QMarkdown.js#L155

To Reproduce
Steps to reproduce the behavior:

1. Add markdown-it-mathjax3:
   onExtend(mdi) {
   const mdMathJax = require("markdown-it-mathjax3");
   mdi.use(mdMathJax);
   },
2. Create q-markdown component:
   <q-markdown :extend="onExtend" :src="` $$A \\setminus B = \\{ x\\mid x\\in A \\text{ and } x \\notin B\\}.$$ `"></q-markdown>

Expected behavior

Screenshots

Suggested solution
Add property to NOT do the \n replacement

[hawkeye64]

Fixed in QMarkdown v2.0.0-alpha.6.
If you need this for v1.x let me know.