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233f67b419
- fixes for handling Polygon25D - add QgsAbstractGeometryV2::convertTo( QgsWKBTypes::Type type ) for easy conversion between geometry types - fix crash when calculating perimeter with no exterior ring - ensure that added rings respect dimensionality of polygon (avoids issues such as polygons with z having a ring without z, or a Polygon25D with LineStringZ rings) - if a curved ring is added to a polygon then a segmentized version of the ring is used (can't have a Polygon with a CircularString ring) - when calling setInteriorRings, make sure empty rings are skipped and that all rings are converted to correct type for polygon - don't crash when requesting or removing interior ring with index < 0