Fix bug with uninitialized undo list of an indirect buffer (Bug#18180).

* buffer.c (Fmake_indirect_buffer): Initialize undo list with the
base buffer's undo list.

src/ChangeLog

@@ -1,3 +1,9 @@
+2014-08-05  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	Fix bug with uninitialized undo list of an indirect buffer (Bug#18180).
+	* buffer.c (Fmake_indirect_buffer): Initialize undo list with the
+	base buffer's undo list.
+
 2014-08-03  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	Fix bug with an attempt to select uninitialized frame (Bug#18161).

src/buffer.c

@@ -809,6 +809,9 @@ CLONE nil means the indirect buffer's state is reset to default values.  */)
   set_string_intervals (name, NULL);
   bset_name (b, name);
 
+  /* An indirect buffer shares undo list of its base (Bug#18180).  */
+  bset_undo_list (b, BVAR (b->base_buffer, undo_list));
+
   reset_buffer (b);
   reset_buffer_local_variables (b, 1);