From f97ebe961b5433d621d76b310334f7270902d6bf Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Sun, 11 Jun 2017 15:16:17 +0200
Subject: [PATCH] Fixed some stupid mistakes in algorithm.

---
 src/Avalonia.Layout/LayoutManager.cs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Avalonia.Layout/LayoutManager.cs b/src/Avalonia.Layout/LayoutManager.cs
index e8fc7acf2a..0933af7d7e 100644
--- a/src/Avalonia.Layout/LayoutManager.cs
+++ b/src/Avalonia.Layout/LayoutManager.cs
@@ -129,13 +129,13 @@ namespace Avalonia.Layout
                 Measure(parent);
             }
 
-            if (!control.IsMeasureValid)
+            if (!control.IsMeasureValid && control.IsAttachedToVisualTree)
             {
                 if (control is ILayoutRoot root)
                 {
                     root.Measure(Size.Infinity);
                 }
-                else if (!control.IsMeasureValid && control.IsAttachedToVisualTree)
+                else
                 {
                     control.Measure(control.PreviousMeasure.Value);
                 }
@@ -151,13 +151,13 @@ namespace Avalonia.Layout
                 Arrange(parent);
             }
 
-            if (!control.IsArrangeValid)
+            if (!control.IsArrangeValid && control.IsAttachedToVisualTree)
             {
                 if (control is ILayoutRoot root)
                 {
                     root.Arrange(new Rect(control.DesiredSize));
                 }
-                else if (!control.IsArrangeValid && control.IsAttachedToVisualTree)
+                else
                 {
                     control.Arrange(control.PreviousArrange.Value);
                 }