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David Schleef authored
Old code was difficult to understand exactly how the neighboring scan lines are calculated, and it appeared that some were off by +2 or -2, depending on the field flag. Fixes #639321.
c2b343cd
Old code was difficult to understand exactly how the neighboring scan lines are calculated, and it appeared that some were off by +2 or -2, depending on the field flag. Fixes #639321.