From 64287fe148c2e023ade61c6b38672d90ddda474a Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Fri, 18 Nov 2016 21:32:12 +0100
Subject: [PATCH] Prevent out-of-bounds in DirtyRects.Coalesce.

---
 src/Avalonia.Visuals/Rendering/DirtyRects.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Visuals/Rendering/DirtyRects.cs b/src/Avalonia.Visuals/Rendering/DirtyRects.cs
index 67ec1b0c48..76cf8c8e5f 100644
--- a/src/Avalonia.Visuals/Rendering/DirtyRects.cs
+++ b/src/Avalonia.Visuals/Rendering/DirtyRects.cs
@@ -42,7 +42,7 @@ namespace Avalonia.Rendering
                 {
                     var b = _rects[j];
 
-                    if (a.Intersects(b))
+                    if (i < _rects.Count && a.Intersects(b))
                     {
                         _rects[i] = _rects[i].Union(b);
                         _rects.RemoveAt(i);