force web spreadsheet resize on stylebar open/close

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35430 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35431 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
deferred spreadsheet settings change

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35432 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e