Fix for sync. issue on file loading

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34147 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Better code instead of r34111

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34148 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure undo info is inited, but silently

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34149 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e