<p>In continuation of the my <a href="https://stackoverflow.com/questions/138331/any-decent-text-diffmerge-engine-for-net">previous question</a>, are the any good controls for text diffs visualization?</p>

<p>Something like StackOverflow's revision diff viewer but for WinForms or WPF</p>

<p>Requirements:</p>

<ul>
<li>free, preferably open-source</li>
<li>based on WPF or WinForms</li>
</ul>

<p>No apps please, only components.  </p>

<p><strong>I'm not interested in OSS diff tools</strong></p>

I never heard about a specific .NET component for diff visualization (it's kind a niche), but perhaps you could rely on advanced editor to build your own without too much trouble.
Syncfusion proposes a
complete component suite
dedicated to text/code edition, with a lot of built in features that you might find useful :
Line and selection background
Text highlighting
(colored underline, waveline, borders, strike, etc.)
Selection margin
Text selection
Syntax highlighting
Important note : it is
not
free.