public SpanManager delete(int start,int end){
  sb.delete(start,end);
  adjustLists(start,start - end);
  if (calculateSrcPositions)   for (int i=0; i < end - start; i++)   ib.remove(start);
  return this;
}

public SpanManager delete ( int start , int end ) { sb . delete ( start , end ) ; adjustLists ( start , start - end ) ; if ( calculateSrcPositions ) for ( int i = 0 ; i < end - start ; i ++ ) ib . remove ( start ) ; return this ; }
deletes the content between start ( included ) and end ( excluded ) .
