From 582389e60b73559376f2378fe9dcd821d25991cc Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Tue, 22 Mar 2022 10:55:32 +0000
Subject: [PATCH] Merge pull request #7832 from
 AvaloniaUI/fixes/7815-overlaylayer-measure

Measure overlay layer children to constraint.
---
 src/Avalonia.Controls/Primitives/OverlayLayer.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/Primitives/OverlayLayer.cs b/src/Avalonia.Controls/Primitives/OverlayLayer.cs
index 5150033a53..7431cf001f 100644
--- a/src/Avalonia.Controls/Primitives/OverlayLayer.cs
+++ b/src/Avalonia.Controls/Primitives/OverlayLayer.cs
@@ -23,7 +23,14 @@ namespace Avalonia.Controls.Primitives
         }
 
         public bool HitTest(Point point) => Children.HitTestCustom(point);
-        
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            foreach (Control child in Children)
+                child.Measure(availableSize);
+            return availableSize;
+        }
+
         protected override Size ArrangeOverride(Size finalSize)
         {
             // We are saving it here since child controls might need to know the entire size of the overlay