Fix beg_col calculation when painting from window start.

 xdisp.c (mouse_face_from_buffer_pos): Don't compute beg_col
 if already decided to paint from beginning of window.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 61afecff203..25649a1a83b 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -12,7 +12,8 @@
         (mouse_face_from_buffer_pos): Rewrite to not assume that
         START_CHARPOS is always in mouse_face_beg_row.  If necessary, swap
         mouse_face_beg_row and mouse_face_end_row so that the former is
-        always above the latter or identical to it.
+        always above the latter or identical to it.  Don't compute beg_col
+        if already decided to paint from beginning of window.
 
 2010-08-28  Eli Zaretskii  <eliz@gnu.org>