Fix bug #11587 with a crash in an Info buffer under linum-mode.

 src/xdisp.c (handle_stop): Detect whether we have overlay strings
 loaded by testing it->current.overlay_string_index to be
 non-negative, instead of checking whether n_overlay_strings is
 positive.

2 files changed, 8 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index d8d14005d1e..489c40a4d4d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2012-05-30  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (handle_stop): Detect whether we have overlay strings
+        loaded by testing it->current.overlay_string_index to be
+        non-negative, instead of checking whether n_overlay_strings is
+        positive.  (Bug#11587)
+
 2012-05-30  Chong Yidong  <cyd@gnu.org>
 
         * keymap.c (describe_map_tree): Revert 2011-07-07 change (Bug#1169).
diff --git a/src/xdisp.c b/src/xdisp.c
index a3227b556a9..6762bf85eb4 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -3157,7 +3157,7 @@ handle_stop (struct it *it)
                      onto the stack one more time, which is not
                      expected by the rest of the code that processes
                      overlay strings.  */
-                  || (it->n_overlay_strings <= 0
+                  || (it->current.overlay_string_index < 0
                       ? !get_overlay_strings_1 (it, 0, 0)
                       : 0))
                 {