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.

1 files changed, 1 insertions, 1 deletions

diff --git a/screen.c b/screen.c
index f1a723a3..650278b2 100644
--- a/screen.c
+++ b/screen.c
@@ -183,7 +183,7 @@ 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);