bug#4240: 23.1.50; C-u doesn't work with Swedish characters

[Juri Linkov <juri@jurta.org>]

> I hit "C-u ä" expecting it to come out as "ääää".  Instead it comes out
> as "ä\344\344ä".  I try "C-u C-u ä" and it comes out as "ä" followed by
> fourteen "\344" and then a trailing "ä".  This happens no matter which
> kind of repetition I'm doing, be it using C-u or using e.g. M-3.  It's
> always the leading and the trailing character that come out right, all
> of the other ones are "broken".

Please see bug#4037:
http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=4037

I received no confirmation that my proposed fix is correct.

Maybe the right fix is to reverse negation?  It seems logical to check
if a buffer is unibyte before converting from unibyte to multibyte, but
I don't understand what this code was supposed to do.

Index: src/cmds.c
===================================================================
RCS file: /sources/emacs/emacs/src/cmds.c,v
retrieving revision 1.107
diff -u -r1.107 cmds.c
--- src/cmds.c	13 Jul 2009 01:02:51 -0000	1.107
+++ src/cmds.c	10 Aug 2009 22:54:02 -0000
@@ -337,7 +337,7 @@
 	/* Add the offset to the character, for Finsert_char.
 	   We pass internal_self_insert the unmodified character
 	   because it itself does this offsetting.  */
-	if (! NILP (current_buffer->enable_multibyte_characters))
+	if (NILP (current_buffer->enable_multibyte_characters))
 	  modified_char = unibyte_char_to_multibyte (modified_char);
 
 	XSETFASTINT (n, XFASTINT (n) - 2);

-- 
Juri Linkov
http://www.jurta.org/emacs/