Nyall Dawson 49742c302a [needs-docs][processing] Add option to check validity alg to ignore self-intersection
causing rings errors

By default the algorithm now uses the strict OGC definition of polygon validity, where
a polygon is marked as invalid if a self-intersecting ring causes an interior hole.
If the "Ignore ring self intersections" option is checked, then this rule will be
ignored and a more lenient validity check will be performed.

Refs #16418, refs #21336
2019-02-27 06:05:26 +10:00
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