From cdbe48cc83851b46e297c27ee3e22ef3e1b06392 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Tue, 14 Jun 2016 20:58:44 -0400
Subject: [PATCH] Plugged a potential memory corruption in darwin/grid.m. Now
 we have to do the same on Windows: ensure that hidden cells are taken into
 account when computing xmin/xmax/ymin/ymax and abort if there's nothing
 there.

---
 darwin/grid.m | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/darwin/grid.m b/darwin/grid.m
index 200c2a1b..aaf7a142 100644
--- a/darwin/grid.m
+++ b/darwin/grid.m
@@ -177,6 +177,8 @@ struct uiGrid {
 		if (ymax < (gc.top + gc.yspan))
 			ymax = gc.top + gc.yspan;
 	}
+	if (first == YES)		// the entire grid is hidden; do nothing
+		return;
 	xcount = xmax - xmin;
 	ycount = ymax - ymin;