Add code to initialize bidi iterator for displaying strings.

For now, ifdef'ed away.  Some more testing.

 src/bidi.c (bidi_level_of_next_char): Allow the sentinel "position"
 to pass the test for valid cached positions.
 src/xdisp.c (init_iterator): Call bidi_init_it only of a valid
 buffer position was specified.  Initialize paragraph_embedding to L2R.
 (reseat_to_string): Initialize the bidi iterator (for now ifdef'ed out).
 (display_string): If we need to ignore text properties of
 LISP_STRING, set IT->stop_charpos to IT->end_charpos.  (The
 original value of -1 will not work with bidi.)
 src/dispextern.h (struct bidi_string_data): New member lstring.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 0f7089d7916..979cb43e98f 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1814,7 +1814,8 @@ struct bidi_stack {
 
 /* Data type for storing information about a string being iterated on.  */
 struct bidi_string_data {
-  const unsigned char *s;       /* the string, or NULL if reordering buffer */
+  Lisp_Object lstring;          /* Lisp string to reorder, or nil */
+  const unsigned char *s;       /* string data, or NULL if reordering buffer */
   EMACS_INT schars;             /* the number of characters in the string,
                                    excluding the terminating null */
   unsigned from_disp_str : 1;   /* 1 means the string comes from a