[PostGIS] #5991: Distance calculation error for CircularString

[PostGIS]

#5991: Distance calculation error for CircularString
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  assigned
 Priority:  high     |  Milestone:  PostGIS 3.2.9
Component:  postgis  |    Version:  master
 Keywords:           |
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 The circular arc distance calculation, and a few others, is not properly
 updating the DISTPTS state object, and instead just writing their
 information into it without checking the current state. Mostly this does
 not happen, but where it does, it definitely will be causing wrong answers
 to crop up.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5991>
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