Ticket #2971: reverted my previous commit, it has caused worse bugs

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23083 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
GGW_ext working properly, see circle_tangents.html for example.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23084 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e