Open trace dialog makes an exception with blue dot

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31856 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4096: parametric 3D parsing -- undoing changes from r27453, rest was undone in r28023, so hopefully not needed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31858 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e