MacEmacs JP

http://blog.y-satou.jp/2012/01/cocoa-emacs-inline-patch-args-out-of.html のパッチ自体は今の inline patch には含まれているようなので、最初のデバッグプリントの部分を参考にして、

 (defun ns-insert-marked-text (pos len)
   "Insert contents of `ns-working-text' as UTF-8 string and mark with
 `ns-working-overlay' and `ns-marked-overlay'.  Any previously existing
 working text is cleared first. The overlay is assigned the faces 
 `ns-working-text-face' and `ns-marked-text-face'."
   (message "DEBUG: pos=[\%d]  len=[\%d]  ns-working-text=[\%s]  text-len=[\%d]" pos len ns-working-text (length ns-working-text))
   (ns-delete-working-text)
   (message "DEBUG: ns-delete-working-text done")
   (let ((start (point)))
     (if (<= pos (length ns-working-text))
       (progn
         (put-text-property pos len 'face 'ns-working-text-face ns-working-text)
         (message "DEBUG: put-text-property pos len 'face 'ns-working-text-face ns-working-text done")
         (insert ns-working-text)
         (message "DEBUG: insert-ns-working-text done")
         (if (= len 0)
             (overlay-put (setq ns-working-overlay
                                (make-overlay start (point) (current-buffer) nil t))
                          'face 'ns-working-text-face)
           (overlay-put (setq ns-working-overlay
                              (make-overlay start (point) (current-buffer) nil t))
                        'face 'ns-unmarked-text-face)
           (overlay-put (setq ns-marked-overlay 
                              (make-overlay (+ start pos) (+ start pos len)
                                            (current-buffer) nil t))
                        'face 'ns-marked-text-face))
         (goto-char (+ start pos)))
       (message "DEBUG: SKIPPED put-text-property pos len 'face 'ns-working-text-face ns-working-text")
       )))

として調べてみたところ、(入力が速くて追いつかなかったときに?)確定した文字列が消えて次の入力だけ残った時に text-len より len が大きくなって Args out of range になるようです。

ns-insert-marked-text の呼び出し元の ns-put-marked-text が ns-win.el になくて、どこから呼ばれているのかすぐにはわからなかったので、ここまでしか調査できていません。