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qi see it now. It's not documented, but I see it's a public class.
No documentation:
https://doc.qt.io/qt-6/animation-overview.html#classes-in-the-animation-framework
But, public:
https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/animation/qabstractanimation.h?h=6.2.3#n142