From ddf266d9ae6bb9220e7b53a2ec63215f2c8b62a8 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Wed, 18 May 2022 13:20:08 +0200
Subject: [PATCH] Invalidate measure when showing a control.

But not when hiding it.
---
 src/Avalonia.Base/Layout/Layoutable.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Avalonia.Base/Layout/Layoutable.cs b/src/Avalonia.Base/Layout/Layoutable.cs
index f425c04a71..f30925f489 100644
--- a/src/Avalonia.Base/Layout/Layoutable.cs
+++ b/src/Avalonia.Base/Layout/Layoutable.cs
@@ -797,7 +797,15 @@ namespace Avalonia.Layout
             if (change.Property == IsVisibleProperty)
             {
                 DesiredSize = default;
+
+                // All changes to visibility cause the parent element to be notified.
                 this.GetVisualParent<ILayoutable>()?.ChildDesiredSizeChanged(this);
+
+                // We only invalidate outselves when visibility is changed to true.
+                if (change.GetNewValue<bool>())
+                {
+                    InvalidateMeasure();
+                }
             }
         }