(Fset_buffer_multibyte): Correctly recover a narrowed

region when a buffer is changed to unibyte.

src/ChangeLog

@@ -5,6 +5,9 @@
 
 2003-05-31  Kenichi Handa  <handa@m17n.org>
 
+	* buffer.c (Fset_buffer_multibyte): Correctly recover a narrowed
+	region when a buffer is changed to unibyte.
+
 	* charset.h (VALID_LEADING_CODE_P): New macro.
 	(UNIBYTE_STR_AS_MULTIBYTE_P): Check more rigidly.
 

src/buffer.c

@@ -2049,7 +2049,7 @@ but the contents viewed as characters do change.  */)
   Lisp_Object tail, markers;
   struct buffer *other;
   int undo_enabled_p = !EQ (current_buffer->undo_list, Qt);
-  int begv = BEGV, zv = ZV;
+  int begv, zv;
   int narrowed = (BEG != begv || Z != zv);
   int modified_p = !NILP (Fbuffer_modified_p (Qnil));
 
@@ -2068,6 +2068,11 @@ but the contents viewed as characters do change.  */)
   /* If the cached position is for this buffer, clear it out.  */
   clear_charpos_cache (current_buffer);
 
+  if (NILP (flag))
+    begv = BEGV_BYTE, zv = ZV_BYTE;
+  else
+    begv = BEGV, zv = ZV;
+
   if (narrowed)
     Fwiden ();