Adapt compute_display_string_pos to iteration over strings.

Just compiled, not yet tested.

 src/xdisp.c (compute_display_string_pos): First arg is now struct
 `text_pos *'; all callers changed.  Support display properties on
 Lisp strings.
 (compute_display_string_end): Support display properties on Lisp
 strings.
 (init_iterator, reseat_1, reseat_to_string): Initialize the
 string.bufpos member to 0 (zero, for compatibility with IT_CHARPOS
 when iterating on a string not from display properties).
 src/bidi.c (bidi_fetch_char): Support strings with display
 properties.
 src/dispextern.h (struct bidi_string_data): New member bufpos.
 (compute_display_string_pos): Update prototype.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 51e4561f8db..2f305d0daf4 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,22 @@
 2011-06-09  Eli Zaretskii  <eliz@gnu.org>
 
+        * xdisp.c (compute_display_string_pos): First arg is now struct
+        `text_pos *'; all callers changed.  Support display properties on
+        Lisp strings.
+        (compute_display_string_end): Support display properties on Lisp
+        strings.
+        (init_iterator, reseat_1, reseat_to_string): Initialize the
+        string.bufpos member to 0 (zero, for compatibility with IT_CHARPOS
+        when iterating on a string not from display properties).
+
+        * bidi.c (bidi_fetch_char): Support strings with display
+        properties.
+
+        * dispextern.h (struct bidi_string_data): New member bufpos.
+        (compute_display_string_pos): Update prototype.
+
+2011-06-09  Eli Zaretskii  <eliz@gnu.org>
+
         * bidi.c (bidi_level_of_next_char): Allow the sentinel "position"
         to pass the test for valid cached positions.