fix for #1072 (menu not updated after Ctrl-D) [needs backport]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22855 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix for #456 (File->New faulty) [needs backport]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@22856 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e