Code blocks in federated Mastodon posts have mangled line breaks

[pbackus]

Describe the bug

In microblog posts federated from Mastodon posts, line breaks are displayed as <br></br>.

On which Mbin instance did you find the bug?

fedia.io

Which Mbin version was running on the instance?

1.8.0

To Reproduce

1. View the post at https://fedia.io/m/random/p/1589011/from-a-hypothetical-stdlib-where-things-are-not-bad-br-br-typedef
2. View the original post at https://pony.social/@thephd/114047042998822286
3. Observe that the line breaks in the original post's code block have been replaced with <br></br> in the Mbin version.

Expected behavior

The code block should be formatted the same way on both Mbin and the original instance.

Screenshots

Mbin version:

Original version:

Desktop (please complete the following information):

• OS: Debian
• Browser: Firefox
• Browser Version: 135.0b7

[BentiGorlich]

This is probably a problem with out html to markdown parser. Mastodon does not share the markdown source, only the generated html from it