From eb5a354d624f49f4a82f0574a9d4b604db0acf4f Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Wed, 4 Oct 2017 13:13:07 +0100
Subject: [PATCH] [StackPanel] Gap value is not added to the measured width or
 height after the last child.

---
 src/Avalonia.Controls/StackPanel.cs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Avalonia.Controls/StackPanel.cs b/src/Avalonia.Controls/StackPanel.cs
index 0e12fb3283..a6fe35d668 100644
--- a/src/Avalonia.Controls/StackPanel.cs
+++ b/src/Avalonia.Controls/StackPanel.cs
@@ -170,6 +170,15 @@ namespace Avalonia.Controls
                 }
             }
 
+            if (Orientation == Orientation.Vertical)
+            {
+                measuredHeight -= gap;
+            }
+            else
+            {
+                measuredWidth -= gap;
+            }
+
             return new Size(measuredWidth, measuredHeight);
         }