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added a method QgsGeometry::fast_intersect. This method does the same…
… as QgsGeometry::intersect, but it uses direct generation of geos geometry with QgsGeometry::geosGeometry(). In contrast, QgsGeometry::intersect uses wkt export of QgsGeometry and wkb import of geos. Therefore it is slower than fast_intersect (but better tested). After 0.8, QgsGeometry::fast_intersect may replace QgsGeometry::intersect git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5736 c8812cc2-4d05-0410-92ff-de0c093fc19c
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