Fix part 4 of bug#9771 with assertion violation when wrap-prefix is used

for a line that begins with control characters.

 src/xdisp.c (push_display_prop): Determine whether to record string
 or buffer position by IT->string, not by IT->method.  Allow
 GET_FROM_DISPLAY_VECTOR as IT->method on entry.

2 files changed, 8 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 2c72e97b7f7..53e67a30c38 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2011-10-17  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (push_display_prop): Determine whether to record string
+        or buffer position by IT->string, not by IT->method.  Allow
+        GET_FROM_DISPLAY_VECTOR as IT->method on entry.  (Bug#9771, part 4)
+
 2011-10-15  Martin Rudalics  <rudalics@gmx.at>
 
         * window.c (coordinates_in_window): Rewrite and delabelize
diff --git a/src/xdisp.c b/src/xdisp.c
index 13bb0f79e18..e796eb98f19 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -18427,9 +18427,10 @@ static int
 push_display_prop (struct it *it, Lisp_Object prop)
 {
   struct text_pos pos =
-    (it->method == GET_FROM_STRING) ? it->current.string_pos : it->current.pos;
+    STRINGP (it->string) ? it->current.string_pos : it->current.pos;
 
   xassert (it->method == GET_FROM_BUFFER
+           || it->method == GET_FROM_DISPLAY_VECTOR
            || it->method == GET_FROM_STRING);
 
   /* We need to save the current buffer/string position, so it will be