Question about the ImagePreview Challenge from Krzysztof Magiera’s Talk

[ikiet]

First of all, thank you for creating and maintaining this awesome project.

I’m currently learning it by reading the documentation and watching talks about the library.
I watched Krzysztof Magiera’s talk where he mentioned the ImagePreview challenge in the video below, but I couldn’t find it in the example project.
Is that challenge included in the examples and was it removed recently, or is it from a private repository?

https://youtu.be/kdq4z2708VM?si=w1dt3WN4SzKgTUdz&t=1408