question: public void extendParent ( Object cell ) { if ( cell != null ) { Object parent = model . getParent ( cell ) ; mxGeometry p = model . getGeometry ( parent ) ; if ( parent != null && p != null && ! isCellCollapsed ( parent ) ) { mxGeometry geo = model . getGeometry ( cell ) ; if ( geo != null && ( p . getWidth ( ) < geo . getX ( ) + geo . getWidth ( ) || p . getHeight ( ) < geo . getY ( ) + geo . getHeight ( ) ) ) { p = ( mxGeometry ) p . clone ( ) ; p . setWidth ( Math . max ( p . getWidth ( ) , geo . getX ( ) + geo . getWidth ( ) ) ) ; p . setHeight ( Math . max ( p . getHeight ( ) , geo . getY ( ) + geo . getHeight ( ) ) ) ; cellsResized ( new Object [ ] { parent } , new mxRectangle [ ] { p } ) ; } } } }
target:  Resizes the parents recursively so that they contain the complete area of the resized child cell.