From 74ca462f6d15dec88e7bd06a50401847daae97cf Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Tue, 17 Aug 1999 22:44:37 +0000
Subject: [PATCH] (update_frame_line): If writing whole line, don't write
 trailing spaces unless we must.

---
 src/dispnew.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/dispnew.c b/src/dispnew.c
index b2a2d97dd6..9906022b00 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -4836,10 +4836,18 @@ update_frame_line (frame, vpos)
   /* If display line has unknown contents, write the whole line.  */
   if (must_write_whole_line_p)
     {
-      cursor_to (vpos, 0);
-      write_glyphs (nbody, nlen);
+      if (!must_write_spaces)
+	while (nlen > 0 && CHAR_GLYPH_SPACE_P (nbody[nlen - 1]))
+	  --nlen;
+
+      if (nlen)
+	{
+	  cursor_to (vpos, 0);
+	  write_glyphs (nbody, nlen);
+	}
+      
       cursor_to (vpos, nlen);
-      clear_end_of_line (-1);
+      clear_end_of_line (olen);
       make_current (desired_matrix, current_matrix, vpos);
       return;
     }
-- 
2.20.1