From 21cfef45d6f2774bd3e0868eb085b2f0fccb8112 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Fri, 17 Jul 2009 18:35:55 +0000
Subject: [PATCH] When resizing a screen smaller in alternate screen mode, all
 the lines needed could be consumed by deleting from the bottom, leaving none
 to be removed from the top. In this case, don't call grid_view_delete_lines
 with ny of 0 as this is incorrect and causes a bounds check to fatal error if
 built with -DDEBUG.

---
 screen.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/screen.c b/screen.c
index 02089ff5..aae659c0 100644
--- a/screen.c
+++ b/screen.c
@@ -1,4 +1,4 @@
-/* $Id: screen.c,v 1.92 2009-07-14 06:40:33 nicm Exp $ */
+/* $Id: screen.c,v 1.93 2009-07-17 18:35:55 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -182,7 +182,7 @@ screen_resize_y(struct screen *s, u_int sy)
 		available = s->cy;
 		if (gd->flags & GRID_HISTORY)
 			gd->hsize += needed;
-		else if (available > 0) {
+		else if (needed > 0 && available > 0) {
 			if (available > needed)
 				available = needed;
 			grid_view_delete_lines(gd, 0, available);