Listeners work after click on undo button. (#4077)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31765 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3882 some nice update on StatisticCalculator.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31766 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e