https://bugs.kde.org/show_bug.cgi?id=412738

--- Comment #8 from Christoph Cullmann <cullm...@kde.org> ---
Hmm, I tried to look how 

auto prf= thumbnailPix.devicePixelRatioF();
auto pr = thumbnailPix.devicePixelRatio();

are computed internally for pixmaps.
For the that looks normally done via the ::metric function and pixmaps should
consistently use there something like

image.devicePixelRatio() * QPaintDevice::devicePixelRatioFScale();

Could you step into the thumbnailPix.devicePixelRatioF() call where it ends up?

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