+(declare-function notmuch-show-refresh-view "notmuch-show" (&optional reset-state))
+
+(defun notmuch-crypto--async-key-sentinel (process event)
+ "When the user asks for a GPG key to be retrieved
+asynchronously, handle completion of that task.
+
+If the retrieval is successful, the thread where the retrieval
+was initiated is still displayed and the cursor has not moved,
+redisplay the thread."
+ (let ((status (process-status process))
+ (exit-status (process-exit-status process))
+ (keyid (process-get process :gpg-key-id)))
+ (when (memq status '(exit signal))
+ (message "Getting the GPG key %s asynchronously...%s."
+ keyid
+ (if (= exit-status 0)
+ "completed"
+ "failed"))
+ ;; If the original buffer is still alive and point didn't move
+ ;; (i.e. the user didn't move on or away), refresh the buffer to
+ ;; show the updated signature status.
+ (let ((show-buffer (process-get process :notmuch-show-buffer))
+ (show-point (process-get process :notmuch-show-point)))
+ (when (and (bufferp show-buffer)
+ (buffer-live-p show-buffer)
+ (= show-point
+ (with-current-buffer show-buffer
+ (point))))
+ (with-current-buffer show-buffer
+ (notmuch-show-refresh-view)))))))
+
+(defun notmuch-crypto--set-button-label (button label)
+ "Set the text displayed in BUTTON to LABEL."
+ (save-excursion
+ (let ((inhibit-read-only t))
+ ;; This knows rather too much about how we typically format
+ ;; buttons.
+ (goto-char (button-start button))
+ (forward-char 2)
+ (delete-region (point) (- (button-end button) 2))
+ (insert label))))
+