Fix drawing vertical or horizontal line segments in Shapes layer #5895
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Closes #4538.
In #4538, @psobolewskiPhD reported that something prevented drawing of Shapes line segments that were either perfectly vertical or perfectly horizontal. This was caused by faulty logic meant to prevent drawing segments that are too small. This changes the logic to prevent changing a scale to 0, which fixes the bug. It also renames some variables to make the logic easier to follow.