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The requested size for a thumbnail specifies a bounding box (in pixels) of type `QSize` to which
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the thumbnail will be scaled.
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(The aspect ratio of the original image is preserved.) Passing `QSize(0,`<i>n</i>`)` or `QSize(`<i>n</i>`,0)`
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Original images are never scaled up, so the returned thumbnail may be smaller than its requested size.