Nested MultiPolygon reported as valid

[mdavis]

Following MultiPolygon with a fully-overlapped element and a hole reports as valid by IsValid.

MULTIPOLYGON (((10 90, 80 90, 80 10, 10 10, 10 90), (51 20, 71 40, 70 20, 51 20)), ((70 80, 20 20, 20 80, 70 80)))

JTS computes this correctly.

The key aspect seems to be the presence of the hole.

Originally reported in ​PostGIS-4893. Data above is much simplified test case which exhibits the problem. Original data is:

MULTIPOLYGON (((1007897.6751335859 165975.99421341717, 1007898.4300533384 165975.52472616732, 1007899.1482277513 165975.01029150188, 1007899.8312972635 165974.44992516935, 1007900.475981012 165973.8459237516, 1007900.6751275957 165973.64251208305, 1007900.722699672 165973.59264342487, 1007900.7725683451 165973.54507133365, 1007900.9759800136 165973.34592474997, 1007901.5799814165 165972.7012410015, 1007902.1403477639 165972.01817150414, 1007902.6547824293 165971.30032517016, 1007903.1213169247 165970.5499985963, 1007903.5376546681 165969.77080066502, 1007903.9024833441 165968.96634033322, 1007904.213506341 165968.1395703405, 1007904.4700675011 165967.29409958422, 1007904.67052643 165966.43386508524, 1007904.734830752 165966.08773717284, 1007904.738767758 165966.0647713393, 1007904.7459855974 165966.0424616784, 1007904.9700665027 165965.29410359263, 1007905.1705254167 165964.43386909366, 1007905.2348297536 165964.08774116635, 1007905.2387667596 165964.0647753328, 1007905.2459845841 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[mdavis]

The issue appears to be caused by ​this line in IndexedNestedShellTester.cpp:

nestedPt = badNestedPt;

It should be

nestedPt = shellPt;

[mdavis]

Fixed by ​47be163ce3