anchor.diff:  ;;;
   ;;;
   ;;;
  -(defclass menu-bar (layout) ())
  +(defclass menu-bar (%layout) ())
   
   
   (defun make-menu-bar ()
  
positive.code: ;;;
  ;;; CUSTOM LAYOUT
  ;;;
  (defclass custom-layout (layout) ())
  
  
  ;;;
  
negative.code: ;;;
  ;;;
  ;;;
  (defclass stacking-layout (expandable panel %layout) ())
  
  
  (defun default-row-height (child-height)
  