Minor additional fix in the wake of bugs #13623 and 13626.

 src/xdisp.c (redisplay_internal): Don't set w->region_showing to the
 marker's position.
 (display_line): Set w->region_showing to the value of
 it->region_beg_charpos, not to -1.  This fixes redisplay
 optimization when cursor is moved up after M->.
 src/window.h (struct window): region_showing can no longer be negative.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 30470f5730a..fb4cc723646 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2013-02-12  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (redisplay_internal): Don't set w->region_showing to the
+        marker's position.
+        (display_line): Set w->region_showing to the value of
+        it->region_beg_charpos, not to -1.  This fixes redisplay
+        optimization when cursor is moved up after M->.  (Bug#13623)
+        (Bug#13626)
+
+        * window.h (struct window): region_showing can no longer be
+        negative.
+
 2013-02-11  Paul Eggert  <eggert@cs.ucla.edu>
 
         Tune by using memchr and memrchr.