An unlinked aligned dimension that was reflected on its own kept its
offset, which is measured along the left normal of a to b. A reflection
turns that normal to the other side, so a line 30 pt above two level
points stayed 30 pt above them after a flip top to bottom instead of
going below them. The offset now changes sign when the transform
reverses orientation, as a reflection or a scale by a negative factor
does. Other transforms leave it as before, and linked, horizontal and
vertical dimensions keep their own rules.
Docs: docs/dimensions.md.
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