anchor.diff:         (setf box-layout (make-instance 'gtk:gtk-box
                                          :orientation :vertical
                                          :spacing 0))
  -       (setf minibuffer-container (make-instance 'gtk:gtk-box
  +       (setf prompt-buffer-container (make-instance 'gtk:gtk-box
                                                    :orientation :vertical
                                                    :spacing 0))
          (setf message-container (make-instance 'gtk:gtk-box
  
positive.code:       #'javascript-error-handler))))
  
  (define-ffi-method ffi-prompt-buffer-evaluate-javascript-async ((window gtk-window) javascript)
    (webkit2:webkit-web-view-evaluate-javascript (minibuffer-view window) javascript))
  
  (define-ffi-method ffi-buffer-enable-javascript ((buffer gtk-buffer) value)
    (setf (webkit:webkit-settings-enable-javascript
  
negative.code:   (%within-renderer-thread-async
     (lambda ()
       (with-slots (gtk-object box-layout active-buffer
                    prompt-buffer-container prompt-buffer-view
                    status-buffer status-container
                    message-container message-view
                    id key-string-buffer) window
  