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In qt_scale_image_16bit() and qt_scale_image_32bit(), when a sample
point was located on the border between two pixels in the source image,
the sample point was rounded up instead of down. If a sample point was
exactly on the bottom or right edge of the source image, the function
would therefore sample a pixel outside the image. Because of how the
target rectangle is rounded, a sample point will never be exactly on
the top or left edge of the source image, so we will not get a similar
problem there.
I extended the lance test pixmap_scaling.qps.
Task-number: 258533
Reviewed-by: Samuel
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