try to make isWebstart() work for 5.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25711 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.137.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25712 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Correct update when in a list (sequence)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25713 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e