Intersection of two 'non trivial' equal line segments is Nothing.
Intersection of two 'non trivial' equal line segments is Nothing.

Some seeds (995673573, 1989707522, ...) were making the test
"intersectionOfEqualLineSegmentsIsNothing" fail.
This was because the segment was reduced to a single point.
Now, it only checks non trivial equal segments intersection.

opensolid/geometry