[tests] Add test for issue 20443

src/Controls/tests/TestCases.HostApp/Issues/Issue20443.xaml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Controls.TestCases.HostApp.Issues.Issue20443"
+              xmlns:local="clr-namespace:Controls.TestCases.HostApp.Issues"
+              x:DataType="local:Issue20443ViewModel"
+             Title="Issue20443">
+  <ContentPage.BindingContext>
+        <local:Issue20443ViewModel/>
+    </ContentPage.BindingContext>
+    <Grid>
+        <RefreshView
+            IsRefreshing="{Binding IsRefreshing}"
+            Command="{Binding RefreshCommand}">
+            <CollectionView
+                ItemSizingStrategy="MeasureAllItems"
+                ItemsSource="{Binding Items}">
+                <CollectionView.ItemTemplate>
+                    <local:Issue20443TemplateSelector>
+                        <local:Issue20443TemplateSelector.ItemATemplate>
+                            <DataTemplate>
+                                <Grid
+                                    HeightRequest="20"
+                                    BackgroundColor="Aqua">
+                                    <Label Text="20"/>
+                                </Grid>
+                            </DataTemplate>
+                        </local:Issue20443TemplateSelector.ItemATemplate>
+                        <local:Issue20443TemplateSelector.ItemBTemplate>
+                            <DataTemplate>
+                                <Grid
+                                    HeightRequest="100"
+                                    BackgroundColor="Pink">
+                                    <Label Text="100"/>
+                                </Grid>
+                            </DataTemplate>
+                        </local:Issue20443TemplateSelector.ItemBTemplate>
+                    </local:Issue20443TemplateSelector>
+                </CollectionView.ItemTemplate>
+
+            </CollectionView>
+        </RefreshView>
+    </Grid>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue20443.xaml.cs

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+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Threading.Tasks;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+using System.Runtime.CompilerServices;
+
+namespace Controls.TestCases.HostApp.Issues
+{
+	[Issue(IssueTracker.Github, 20443, "CollectionView item gets wrong size after refresh", PlatformAffected.iOS)]
+
+	public partial class Issue20443 : ContentPage
+	{
+		public Issue20443()
+		{
+			InitializeComponent();
+		}
+	}
+	public class Issue20443ViewModel : INotifyPropertyChanged
+	{
+		public IList<object> Items { get; set; }
+
+		private bool _isRefreshing;
+
+		public bool IsRefreshing
+		{
+			get => _isRefreshing;
+			set
+			{
+				_isRefreshing = value;
+				OnPropertyChanged();
+			}
+		}
+
+		public Command RefreshCommand { get; set; }
+
+		public Issue20443ViewModel()
+		{
+			RefreshCommand = new Command(
+				async () =>
+				{
+					await Task.Delay(2000);
+					IsRefreshing = false;
+				});
+
+			Items = new List<object>();
+			for (int i = 0; i < 100; i++)
+			{
+				Items.Add(new Issue20443ItemA());
+				Items.Add(new Issue20443ItemB());
+				Items.Add(new Issue20443ItemB());
+				Items.Add(new Issue20443ItemB());
+				Items.Add(new Issue20443ItemB());
+			}
+		}
+
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+		{
+			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+		}
+	}
+
+	public class Issue20443ItemA
+	{
+
+	}
+
+	public class Issue20443ItemB
+	{
+
+	}
+
+	public class Issue20443TemplateSelector : DataTemplateSelector
+	{
+		public DataTemplate ItemATemplate { get; set; }
+		public DataTemplate ItemBTemplate { get; set; }
+
+		protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
+		{
+			if (item is Issue20443ItemA)
+			{
+				return ItemATemplate;
+			}
+
+			return ItemBTemplate;
+		}
+	}
+}