Fix bug #10159 with crashes in auto-complete package.

 src/xdisp.c (next_overlay_string): Initialize it->end_charpos for
 the new overlay string.  Otherwise, the call to composition_compute_stop_pos
 in compute_stop_pos uses a wrong it->end_charpos value, and crashes because
 it runs off the end of the overlay string.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 847e065e1c3..4033f51ca1a 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2012-09-22  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (next_overlay_string): Initialize it->end_charpos for
+        the new overlay string.  (Bug#10159)
+
 2012-09-22  Paul Eggert  <eggert@cs.ucla.edu>
 
         * emacs.c (shut_down_emacs): Don't assume stderr is buffered,
diff --git a/src/xdisp.c b/src/xdisp.c
index f00719be37a..c2032696a1c 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -5346,6 +5346,7 @@ next_overlay_string (struct it *it)
       SET_TEXT_POS (it->current.string_pos, 0, 0);
       it->method = GET_FROM_STRING;
       it->stop_charpos = 0;
+      it->end_charpos = SCHARS (it->string);
       if (it->cmp_it.stop_pos >= 0)
         it->cmp_it.stop_pos = 0;
       it->prev_stop = 0;