From 7ecd493745ca9df70249e04f303cfb5451679f10 Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Wed, 27 Sep 2000 11:43:08 +0000
Subject: [PATCH] (window_box_height): Add an assertion.

---
 src/xdisp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/xdisp.c b/src/xdisp.c
index 1c76ec8e797..dfe7c3dd95d 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -818,6 +818,8 @@ window_box_height (w)
 {
   struct frame *f = XFRAME (w->frame);
   int height = XFASTINT (w->height) * CANON_Y_UNIT (f);
+
+  xassert (height >= 0);
   
   if (WINDOW_WANTS_MODELINE_P (w))
     height -= CURRENT_MODE_LINE_HEIGHT (w);
-- 
2.39.5