A commenter in Stackoverflow figured out that it's Yoshimi.
He asks if it is possible to have a demo without all the dependencies.
https://stackoverflow.com/questions/79859360/fltk-wayland-x11-custom-drawing-in-a-pop-up-window#comment140927679_79859360
I'll have a look into my strip-down effort from December, when we
identified the first problem. I didn't finish that, but basically
I had already removed the Synth engine.
Maybe it's possible to just hook that pop-up window into that reduced UI?
-- Hermann
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