From 06e0fae71774a67597503ab1cd58ea8238bf20eb Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 30 May 2022 21:13:09 +0200
Subject: [PATCH] Invalidate measure when Viewbox child changes.

---
 src/Avalonia.Controls/Viewbox.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Avalonia.Controls/Viewbox.cs b/src/Avalonia.Controls/Viewbox.cs
index 01a41a0157..aabfd3ef18 100644
--- a/src/Avalonia.Controls/Viewbox.cs
+++ b/src/Avalonia.Controls/Viewbox.cs
@@ -168,6 +168,8 @@ namespace Avalonia.Controls
 
                         if (_child is not null)
                             VisualChildren.Add(_child);
+
+                        InvalidateMeasure();
                     }
                 }
             }