ambiguous cast

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31983 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Comment it for now : TODO refactor "part of closed surface" to "maybe part of closed surface"

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31984 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e