(insert_1_both, insert_from_string_1)

(insert_from_buffer_1): Recalculate END_UNCHANGED in case the
insert happened in the end_unchanged region.  Otherwise, the
redisplay may be confused and duplicate the last line in the
buffer [seen after save-buffer when require-final-newline==t].

diff --git a/src/insdel.c b/src/insdel.c
index 3383f4e56e285f6fb72c95946e30a28b5ced1a3e..4fdae3a86093e665307aeb607461db249e5ca708 100644 (file)
--- a/src/insdel.c
+++ b/src/insdel.c
@@ -959,6 +959,10 @@ insert_1_both (string, nchars, nbytes, inherit, prepare, before_markers)
   if (GPT_BYTE < GPT)
     abort ();
 
+  /* The insert may have been in the unchanged region, so check again. */
+  if (Z - GPT < END_UNCHANGED)
+    END_UNCHANGED = Z - GPT;
+
   adjust_overlays_for_insert (PT, nchars);
   adjust_markers_for_insert (PT, PT_BYTE,
                             PT + nchars, PT_BYTE + nbytes,
@@ -1082,6 +1086,10 @@ insert_from_string_1 (string, pos, pos_byte, nchars, nbytes,
   if (GPT_BYTE < GPT)
     abort ();
 
+  /* The insert may have been in the unchanged region, so check again. */
+  if (Z - GPT < END_UNCHANGED)
+    END_UNCHANGED = Z - GPT;
+
   adjust_overlays_for_insert (PT, nchars);
   adjust_markers_for_insert (PT, PT_BYTE, PT + nchars,
                             PT_BYTE + outgoing_nbytes,
@@ -1229,6 +1237,10 @@ insert_from_buffer_1 (buf, from, nchars, inherit)
   if (GPT_BYTE < GPT)
     abort ();
 
+  /* The insert may have been in the unchanged region, so check again. */
+  if (Z - GPT < END_UNCHANGED)
+    END_UNCHANGED = Z - GPT;
+
   adjust_overlays_for_insert (PT, nchars);
   adjust_markers_for_insert (PT, PT_BYTE, PT + nchars,
                             PT_BYTE + outgoing_nbytes,