From a877a5d8c96f317cb8c496f0c9afa0304be926a6 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 17 Apr 2020 21:33:18 +0000
Subject: [PATCH] Do not move the cursor to the existing y position if it is
 invalid, go home instead.

---
 tty.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/tty.c b/tty.c
index 4090a115..9c03c08a 100644
--- a/tty.c
+++ b/tty.c
@@ -1739,7 +1739,10 @@ tty_cmd_scrollup(struct tty *tty, const struct tty_ctx *ctx)
 		for (i = 0; i < ctx->num; i++)
 			tty_putc(tty, '\n');
 	} else {
-		tty_cursor(tty, 0, tty->cy);
+		if (tty->cy == UINT_MAX)
+			tty_cursor(tty, 0, 0);
+		else
+			tty_cursor(tty, 0, tty->cy);
 		tty_putcode1(tty, TTYC_INDN, ctx->num);
 	}
 }
@@ -2063,8 +2066,12 @@ tty_region(struct tty *tty, u_int rupper, u_int rlower)
 	 * flag so further output causes a line feed). As a workaround, do an
 	 * explicit move to 0 first.
 	 */
-	if (tty->cx >= tty->sx)
-		tty_cursor(tty, 0, tty->cy);
+	if (tty->cx >= tty->sx) {
+		if (tty->cy == UINT_MAX)
+			tty_cursor(tty, 0, 0);
+		else
+			tty_cursor(tty, 0, tty->cy);
+	}
 
 	tty_putcode2(tty, TTYC_CSR, tty->rupper, tty->rlower);
 	tty->cx = tty->cy = UINT_MAX;