Hi,
Operation "Create convex hull" for a layer creates a polygon while convex hull
for selected features makes a linestring. This is perhaps a bug and against the
definitions of
http://www.vividsolutions.com/jts/javadoc/com/vividsolutions/jts/algorithm/ConvexHull.html
For reproducing, create a new layer, digitise a polygon, select it and do Tools
- Analysis - Convex Hull and have a look at the resulting geometry.
-Jukka Rahkonen-
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