Fix for undo recording in decode_coding.

* coding.c (decode_coding): Record buffer modification before
disabling undo_list.

Fixes: debbugs:11773

2 files changed, 14 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 9cd76d2fc5f..e622d95bff8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-14  Gergely Risko  <gergely@risko.hu>
+
+        * coding.c (decode_coding): Record buffer modification before
+        disabling undo_list (Bug#11773).
+
 2012-08-14  Dmitry Antipov  <dmantipov@yandex.ru>
 
         Revert and cleanup some recent overlay changes.
diff --git a/src/coding.c b/src/coding.c
index 08633d8bcff..c601a18b26e 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7102,6 +7102,15 @@ decode_coding (struct coding_system *coding)
         set_buffer_internal (XBUFFER (coding->dst_object));
       if (GPT != PT)
         move_gap_both (PT, PT_BYTE);
+
+      /* We must disable undo_list in order to record the whole insert
+         transaction via record_insert at the end.  But doing so also
+         disables the recording of the first change to the undo_list.
+         Therefore we check for first change here and record it via
+         record_first_change if needed.  */
+      if (MODIFF <= SAVE_MODIFF)
+        record_first_change ();
+
       undo_list = BVAR (current_buffer, undo_list);
       BSET (current_buffer, undo_list, Qt);
     }