iverase opened a new pull request #1280: LUCENE-9239: Change withinTriangle 
logic for Circles
URL: https://github.com/apache/lucene-solr/pull/1280
 
 
   see https://issues.apache.org/jira/browse/LUCENE-9239 for an explanation.
   
   The idea of the new logic is to exploit the fact that for Circles we know an 
inside point of the shape. Therefore for the shape to be a candidate it is 
enough to know that this point is inside one of the triangles.
   
   We only check line intersections for edges that belong to the original 
polygon.

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