question: public SpanManager replace ( int start , int end , String str ) { sb . replace ( start , end , str ) ; if ( calculateSrcPositions ) { for ( int i = 0 ; i < end - start ; i ++ ) ib . remove ( start ) ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) ib . add ( start , - 1 ) ; } adjustLists ( start , str . length ( ) - ( end - start ) ) ; return this ; }
target:  Replaces the content between start (included) and end (excluded) with a String