patch 8.0.0515: ml_get errors in silent Ex mode

Problem:    ml_get errors in silent Ex mode. (Dominique Pelle)
Solution:   Clear valid flags when setting the cursor.  Set the topline when
            not in full screen mode.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 8755f05..dd5e0a8 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -10361,6 +10361,7 @@
 	    {
 		curwin->w_cursor.lnum = eap->line1++;
 		curwin->w_cursor.col = 0;
+		check_cursor_moved(curwin);
 	    }
 
 	    exec_normal_cmd(