try {
String oldText = engine.getPureText( page.getName(), WikiProvider.LATEST_VERSION );
String[] first = Diff.stringToArray( oldText );
String[] second = Diff.stringToArray( newText );
Revision rev = Diff.diff( first, second, new MyersDiff() );
if( rev == null || rev.size() == 0 ) {
return ch;
}