anchor.diff:                   :web-context (make-context buffer)))
   
   (defmethod initialize-instance :after ((buffer status-buffer) &key)
  -  (PREFIX-within-renderer-thread-async
  +  (%within-renderer-thread-async
      (lambda ()
        (with-slots (gtk-object) buffer
          (setf gtk-object (make-web-view buffer))
  
positive.code:       #'javascript-error-handler))))
  
  (defmethod ffi-buffer-evaluate-javascript-async ((buffer gtk-buffer) javascript)
    (PREFIX-within-renderer-thread-async
     (lambda ()
       (webkit2:webkit-web-view-evaluate-javascript
        (gtk-object buffer)
  
negative.code:         (webkit:webkit-web-view-load-uri (gtk-object buffer) (object-string uri)))))
  
  (defmethod ffi-buffer-evaluate-javascript ((buffer gtk-buffer) javascript)
    (%within-renderer-thread
     (lambda (&optional channel)
       (webkit2:webkit-web-view-evaluate-javascript
        (gtk-object buffer)
  