question: @ Deprecated protected void insertAtBoundry ( JEditorPane editor , HTMLDocument doc , int offset , Element insertElement , String html , HTML . Tag parentTag , HTML . Tag addTag ) { Element e ; Element commonParent ; boolean isFirst = ( offset == 0 ) ; if ( offset > 0 || insertElement == null ) { e = doc . getDefaultRootElement ( ) ; while ( e != null && e . getStartOffset ( ) != offset && ! e . isLeaf ( ) ) { e = e . getElement ( e . getElementIndex ( offset ) ) ; } commonParent = ( e != null ) ? e . getParentElement ( ) : null ; } else { commonParent = insertElement ; } if ( commonParent != null ) { int pops = 0 ; int pushes = 0 ; if ( isFirst && insertElement != null ) { e = commonParent ; while ( e != null && ! e . isLeaf ( ) ) { e = e . getElement ( e . getElementIndex ( offset ) ) ; pops ++ ; } } else { e = commonParent ; offset -- ; while ( e != null && ! e . isLeaf ( ) ) { e = e . getElement ( e . getElementIndex ( offset ) ) ; pops ++ ; } e = commonParent ; offset ++ ; while ( e != null && e != insertElement ) { e = e . getElement ( e . getElementIndex ( offset ) ) ; pushes ++ ; } } pops = Math . max ( 0 , pops - 1 ) ; insertHTML ( editor , doc , offset , html , pops , pushes , addTag ) ; } }
target:  This is invoked when inserting at a boundary. It determines the number of pops, and then the number of pushes that need to be performed, and then invokes insertHTML.