From ca02947c3ee9d24782146e2e784c50b84a16ca5c Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@users.noreply.github.com>
Date: Thu, 18 May 2023 10:35:08 +0200
Subject: [PATCH] Added failing test for VirtualizingStackPanel.

---
 .../VirtualizingStackPanelTests.cs            | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tests/Avalonia.Controls.UnitTests/VirtualizingStackPanelTests.cs b/tests/Avalonia.Controls.UnitTests/VirtualizingStackPanelTests.cs
index aa03a77d70..1fddaab910 100644
--- a/tests/Avalonia.Controls.UnitTests/VirtualizingStackPanelTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/VirtualizingStackPanelTests.cs
@@ -657,6 +657,40 @@ namespace Avalonia.Controls.UnitTests
             root.LayoutManager.ExecuteLayoutPass();
         }
 
+        [Fact]
+        public void ScrollIntoView_On_Effectively_Invisible_Panel_Does_Not_Create_Ghost_Elements()
+        {
+            var items = new[] { "foo", "bar", "baz" };
+            var (target, _, itemsControl) = CreateUnrootedTarget(items: items);
+            var container = new Decorator { Margin = new Thickness(100), Child = itemsControl };
+            var root = new TestRoot(true, container);
+
+            root.LayoutManager.ExecuteInitialLayoutPass();
+
+            // Clear the items and do a layout to recycle all elements.
+            itemsControl.ItemsSource = null;
+            root.LayoutManager.ExecuteLayoutPass();
+
+            // Should have no realized elements and 3 unrealized elements.
+            Assert.Equal(0, target.GetRealizedElements().Count);
+            Assert.Equal(3, target.Children.Count);
+
+            // Make the panel effectively invisible and set items.
+            container.IsVisible = false;
+            itemsControl.ItemsSource = items;
+
+            // Try to scroll into view while effectively invisible.
+            target.ScrollIntoView(0);
+
+            // Make the panel visible and layout.
+            container.IsVisible = true;
+            root.LayoutManager.ExecuteLayoutPass();
+
+            // Should have 3 realized elements and no unrealized elements.
+            Assert.Equal(3, target.GetRealizedElements().Count);
+            Assert.Equal(3, target.Children.Count);
+        }
+
         private static IReadOnlyList<int> GetRealizedIndexes(VirtualizingStackPanel target, ItemsControl itemsControl)
         {
             return target.GetRealizedElements()