Check for invalid polygonal geometry before fixing #656
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Signed-off-by: Martin Davis <mtnclimb@gmail.com>
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Some algorithms (including
DouglasPeuckerSimplifier,VWSimplifier,Densifier) may produce invalid polygonal topology, and so include a cleaning step to ensure the result value is valid.This PR adds a test to see if the result is actually invalid before running the potentially expensive cleaning process.