patch 9.0.0883: a silent mapping may cause dots on the command line

Problem:    A silent mapping may cause dots on the command line.
Solution:   Don't show dots for completion if they are not going to be removed
            again. (closes #11501)
diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 4f12625..228d4bc 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -226,8 +226,13 @@
 	return FAIL;
     }
 
-    msg_puts("...");	    // show that we are busy
-    out_flush();
+    // If cmd_silent is set then don't show the dots, because redrawcmd() below
+    // won't remove them.
+    if (!cmd_silent)
+    {
+	msg_puts("...");	    // show that we are busy
+	out_flush();
+    }
 
     i = (int)(xp->xp_pattern - ccline->cmdbuff);
     xp->xp_pattern_len = ccline->cmdpos - i;