(after-insert-file-set-buffer-file-coding-system): If the buffer

size is greater than INSERTED, judget that we are not visiting.

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/international/mule.el b/lisp/international/mule.el
index f193ef7797f..bd9e75220e6 100644
--- a/lisp/international/mule.el
+++ b/lisp/international/mule.el
@@ -1083,8 +1083,10 @@ function by default."
           (if (and enable-multibyte-characters
                    (or (eq coding-system 'no-conversion)
                        (eq (coding-system-type coding-system) 5))
-                   ;; If buffer was unmodified, we must be visiting it.
-                   (not modified-p))
+                   ;; If buffer was unmodified and the size is the
+                   ;; same as INSERTED, we must be visiting it.
+                   (not modified-p)
+                   (= (buffer-size) inserted))
               ;; For coding systems no-conversion and raw-text...,
               ;; edit the buffer as unibyte.
               (let ((pos-byte (position-bytes (+ (point) inserted))))