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ScintillaNET
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That's happening here, by the way - you can see the WindowsFormsHost on line 35 at the time of writing this.
I'm using the ScintillaNET NuGet package. It had its last update 6 years ago. Its last repo commit 5 years ago. The documentation... is lacking - for example, copying example code from there immediately gave me obsolete warnings. Still, this was simply the only library I could find for this.
Not OP, but at work I recently implemented an HTML/CSS/JS code editor and used AvalonEdit to great effect for syntax highlighting in a large multi-line textbox. I was also able to add custom linting via regexs and it's got custom theming capabilities. Super happy with it.