GeoList : correct main direction

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23244 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Prevent z-fight for quadrics

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23245 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e