linenoise: no wasteful retrace on clear screen.

* linenoise/linenoise.c (lino_clear_screen): Set
l->maxrows to zero so that refresh_multiline won't emit
useless upward cursor movement sequences. These have nowhere
to go from the top line of the screen.

1 files changed, 1 insertions, 0 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index a48ad4d1..e50eed2e 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -269,6 +269,7 @@ failed:
 
 /* Clear the screen. Used to handle ctrl+l */
 int lino_clear_screen(lino_t *ls) {
+    ls->maxrows = 0;
     return (write(ls->ofd,"\x1b[H\x1b[2J",7) > 0);
 }