[solved] How to activate a QPainter::beginNativePainting, Painter inactive QGLWidget?

[ralfwickum]

Replacing

painter.beginNativePainting();
painter.endNativePainting();

painter.beginNativePainting();
painter.endNativePainting();

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through

painter.begin(this);
painter.end();

painter.begin(this);
painter.end();

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fixed it for me!