Posting code is bugged

[cyberalien]

Example of post text (link instead of code because GitHub converts Markdown): https://gist.github.com/cyberalien/3bf1871bc10236acb5c09c394d8d5422

When posting that message (copy/paste from Gist), editor bugs out, treating whole message as code block:

This is result of that post in Mastodon and Elk (I'll open a different bug report for incorrectly rendering it):