force repaint in BrowseGUI

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28246 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Try to fix HD4000

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28247 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e