more robust multipolygon geometry building with invalid outer rings#185
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fixes #179 also, introduce an optimized path for single outer multipolygons. and use a temporary r-tree to speed up building of actual multipolygons (with multiple outer rings).
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"intersects" doesn't work for nested outer rings
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fixes #179 and introduce an optimized code path for single-outer-multipolygons, and introduces a temporary r-tree to speed up building of actual multipolygons (with multiple outer rings).
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Corresponding issue
Closes #179
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