Hi Marc,

> This would be handy with very complex shapes, like a countries on
> a world map for example.

But also be aware that really complex shapes with a tremendous number of segments and points in them will might take quite a long time to process, since the Construct > Planar command analyzes the relationship between each curve to test if one is contained within the other.

If it is taking too long to process on complex shapes you may need to do it more manually by only doing Construct > Planar on one outermost closed shape and then using Trim to cut away the holes rather than relying on Construct > Planar to do it with the automatic containment analysis.

- Michael