Browser's default context menu removed from applets too. (#3072)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23897 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Context menu will close too, if the user clicks on its submenuitems. (#2977)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23898 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e