Fix the subpixel precision offset problem in Color Smudge Paint Op
This patch does two changes: 1) We save not the theoretical hotspot of the lastly painted dab, but the real center of the dab. 2) Disables the calculation of the subpixel precision values for the dab in Color Smudge Op. The point is, the Color Smudge Op needs to access other areas of the image. And this access can be aligned only (yeah, since non-aligned bitBlt is not possible). So using of subpixel precision will 1) break alignment; 2) will make the calculation of the real hotspot of the dab impossible. BUG:327235
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