Fix setting of buffer-file-coding-system for MIME message.

3 files changed, 20 insertions, 6 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 8caa24c1f40..e0c9f552c9f 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,11 @@
+2011-02-19  Kenichi Handa  <handa@m17n.org>
+
+	* mail/rmailmm.el (rmail-mime-find-header-encoding): Be sure to
+	get the header copy into the temporary buffer.
+	(rmail-mime-insert-decoded-text): Ignore us-ascii.
+	(rmail-show-mime): When rmail-mime-coding-system is nil, set
+	buffer-file-coding-system to undecided.
+
 2011-02-18  Eli Zaretskii  <eliz@gnu.org>
 
 	* image-mode.el (image-toggle-display-image): Disable
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 370999dabf8..fc4b642e8bb 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -4287,7 +4287,7 @@ With prefix argument N moves forward N messages with these labels.
 
 ;;;***
 
-;;;### (autoloads (rmail-mime) "rmailmm" "rmailmm.el" "7f6ad821b4543a18139fee9250beea5c")
+;;;### (autoloads (rmail-mime) "rmailmm" "rmailmm.el" "9c0902449733cabd5c7e7d17092a7c69")
 ;;; Generated autoloads from rmailmm.el
 
 (autoload 'rmail-mime "rmailmm" "\
diff --git a/lisp/mail/rmailmm.el b/lisp/mail/rmailmm.el
index d6af925d461..e44dd877e4f 100644
--- a/lisp/mail/rmailmm.el
+++ b/lisp/mail/rmailmm.el
@@ -471,10 +471,11 @@ See `rmail-mime-entity' for the detail."
 HEADER is a header component of a MIME-entity object (see
 `rmail-mime-entity')."
   (with-temp-buffer
-    (let ((last-coding-system-used nil))
+    (let ((buf (current-buffer)))
       (with-current-buffer rmail-mime-mbox-buffer
-	(let ((rmail-buffer rmail-mime-mbox-buffer)
-	      (rmail-view-buffer rmail-mime-view-buffer))
+	(let ((last-coding-system-used nil)
+	      (rmail-buffer rmail-mime-mbox-buffer)
+	      (rmail-view-buffer buf))
 	  (save-excursion
 	    (goto-char (aref header 0))
 	    (rmail-copy-headers (point) (aref header 1)))))
@@ -513,7 +514,9 @@ HEADER is a header component of a MIME-entity object (see
 	      ((string= transfer-encoding "quoted-printable")
 	       (quoted-printable-decode-region pos (point))))))
     (decode-coding-region pos (point) coding-system)
-    (if (or (not rmail-mime-coding-system) (consp rmail-mime-coding-system))
+    (if (and
+	 (or (not rmail-mime-coding-system) (consp rmail-mime-coding-system))
+	 (not (eq (coding-system-base coding-system) 'us-ascii)))
 	(setq rmail-mime-coding-system coding-system))
     (or (bolp) (insert "\n"))))
 
@@ -1301,7 +1304,10 @@ attachments as specfied by `rmail-mime-attachment-dirs-alist'."
 		      (rmail-mime-find-header-encoding
 		       (rmail-mime-entity-header entity)))))
 	  (set-buffer-file-coding-system
-	   (coding-system-base rmail-mime-coding-system) t t))
+	   (if rmail-mime-coding-system
+	       (coding-system-base rmail-mime-coding-system)
+	     'undecided)
+	   t t))
       ;; Decoding failed.  ENTITY is an error message.  Insert the
       ;; original message body as is, and show warning.
       (let ((region (with-current-buffer rmail-mime-mbox-buffer