mule-cmds.el (select-safe-coding-system): If

DEFAULT-CODING-SYSTEM is prefer-utf-8 and the buffer contains
multibyte characters, return utf-8 (or one of it's siblings).

diff --git a/lisp/international/mule-cmds.el b/lisp/international/mule-cmds.el
index 0806006..6ef7709 100644 (file)
--- a/lisp/international/mule-cmds.el
+++ b/lisp/international/mule-cmds.el
@@ -972,7 +972,7 @@ It is highly recommended to fix it before writing to a file."
 
        ;; Classify the defaults into safe, rejected, and unsafe.
        (dolist (elt default-coding-system)
-         (if (or (eq (car codings) 'undecided)
+         (if (or (eq (coding-system-type (car elt)) 'undecided)
                  (memq (cdr elt) codings))
              (if (and (functionp accept-default-p)
                       (not (funcall accept-default-p (cdr elt))))
@@ -1029,6 +1029,11 @@ and try again)? " coding-system auto-cs))
              (error "Save aborted"))))
       (when (and tick (/= tick (buffer-chars-modified-tick)))
        (error "Canceled because the buffer was modified"))
+      (if (and (eq (coding-system-type coding-system) 'undecided)
+              (coding-system-get coding-system :prefer-utf-8)
+              (< (- to from) (- (position-bytes to) (position-bytes from))))
+         (setq coding-system
+               (coding-system-change-text-conversion coding-system 'utf-8)))
       coding-system)))
 
 (setq select-safe-coding-system-function 'select-safe-coding-system)