can't retrieve text/image added by gtk:clipboard-set-with-data

Hi,

I'd like to use GTK:CLIPBOARD-SET-WITH-DATA so that I can carry out some
clean up operations after the data posted to the clipboard is cleared.
But the problem is the text or pixbuf passed to GTK:CLIPBOARD-SET-WITH-DATA
can't be retrieved by gtk:clipboard-wait-for-{text or image} and
gtk:clipboard-request-{text or image}.   The attached code demonstrates
the problem.  Any help to get around this problem will be appreciated.

Best wishes,

-cph

;;------------------------------------------------------------------
;; you'll need this binding to run the test code.

(in-package :gtk)

(defbinding target-table-new-from-list () (vector (inlined target-entry) n-targets)
  (target-list target-list)
  (n-targets int :out))

;;------------------------------------------------------------------

(in-package :cl-user)

;; if we use GTK:CLIPBOARD-SET-TEXT, no problem to retrieve text
;; from the clipboard.

(gtk:clipboard-set-text (gtk:clipboard-get "CLIPBOARD") "text")

;; this returns "text"
(gtk:clipboard-wait-for-text (gtk:clipboard-get "CLIPBOARD"))

;; this prints out (:RECEIVED-TEXT "text")
(gtk:clipboard-request-text (gtk:clipboard-get "CLIPBOARD")
                            (lambda (text)
                              (print (list :received-text text))))

;;------------------------------------------------------------------

(let ((target-list (make-instance 'gtk:target-list)))
  (gtk:target-list-add-text-targets target-list 0)
  (gtk:clipboard-set-with-data (gtk:clipboard-get "CLIPBOARD")
                               (gtk::target-table-new-from-list target-list)
                               ;; get-func
                               #'(lambda (sd info)
                                   (print :get-func)
                                   (gtk:selection-data-set-text sd
                                                                "with data")
                                   (print (list :text-in-selection-data
                                                (gtk:selection-data-get-text sd))))
                               ;; clear-func
                               #'(lambda ()
                                   (print :clear-func))))

;; GET-FUNC is called but this returns NIL.
(gtk:clipboard-wait-for-text (gtk:clipboard-get "CLIPBOARD"))

;; GET-FUNC is called but this prints out (:RECEIVED-TEXT NIL)
(gtk:clipboard-request-text (gtk:clipboard-get "CLIPBOARD")
                            (lambda (text)
                              (print (list :received-text text))))

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