question: public void changeSelectionByOffset ( int offset , boolean extend ) { offset = Math . max ( 0 , offset ) ; offset = Math . min ( offset , model . getByteCount ( ) - 1 ) ; int row = offset / 16 ; int col = offset % 16 ; changeSelection ( row , col , false , extend ) ; }
target:  Changes the selection by an offset into the bytes being edited.