Fix line segments with alignToPixel #9042
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Fix #9039
Simplified reproduce (equal to the added fixture test): https://codepen.io/kurkle/pen/yLMLEyy
Line segment calculation tripped on points at same coordinate on the boundary, it would break the segment at first point at the coordinate and then create one point segments for each point until the boundary condition is not valid anymore.
The fix is to skip the points with equal coordinate compared to previous point. So all the points with same coordinate end up in the same segment.