make sure SetValue[drawable list, number] updates in the Graphics View

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34428 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.273.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34429 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e