* xdisp.c (redisplay): If we're not already showing the region,

	then don't disable the single-line optimizations just because the
	mark isn't where we last displayed it.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 33e58eb95f4..a716a25c3e5 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -435,8 +435,9 @@ redisplay ()
   if (((!NILP (Vtransient_mark_mode)
         && !NILP (XBUFFER (w->buffer)->mark_active))
        != !NILP (w->region_showing))
-      || !EQ (w->region_showing,
-              Fmarker_position (XBUFFER (w->buffer)->mark)))
+      || (!NILP (w->region_showing)
+          && !EQ (w->region_showing,
+                  Fmarker_position (XBUFFER (w->buffer)->mark))))
     this_line_bufpos = -1;
 
   tlbufpos = this_line_bufpos;