Strikethrough missing from federated Mastodon post

[pbackus]

Describe the bug

When a federated Mastodon post is viewed in Mbin, text that has a strikethrough on the original Mastodon instance is displayed without one on Mbin.

On which Mbin instance did you find the bug?

fedia.io

Which Mbin version was running on the instance?

1.7.2

To Reproduce

1. View a post with strikethrough on Mastodon (e.g., https://pony.social/@luna/113250544308288695)
2. View the same post on Mbin (e.g., https://fedia.io/m/random/p/899560/I-m-curious-about-the-state-of-formatting-support-across-the)

Expected behavior

The strikethrough should be displayed when viewing the post on Mbin.

Screenshots

Original Mastodon post:

Appearance on fedia.io:

Desktop (please complete the following information):

• OS: Linux
• Browser: Firefox
• Browser Version: 130.0b8

[BentiGorlich]

The problem is probably in our html to markdown converter which seems to not support strikethroughs

[pbackus]

Relevant discussion here: https://github.com/thephpleague/html-to-markdown/issues/185