Comment # 8 on bug 111241 from Dieter Nützel

BTW

Pierre-Eric can you look into this

Shadertoy shader corruption, too?
https://www.shadertoy.com/view/Xt3cWS

I get it with

Konqueror 5.0.97
KDE Frameworks 5.61.0
Qt 5.13.0

And

Firefox 68.0.1