Index: src/winio.c
===================================================================
--- src/winio.c	(revision 5157)
+++ src/winio.c	(working copy)
@@ -3231,7 +3231,7 @@
 #endif
 
 	/* Make sure the current line is on the screen. */
-	edit_update(CENTER);
+	edit_update(ISSET(SMOOTH_SCROLL) ? NONE : CENTER);
     }
 
     foo = openfile->edittop;