Revert CollectionView, the footer moves to the bottom of the page when the empty view or empty view template is enabled (#27288)

* Revert "CollectionView, the footer moves to the bottom of the page when the empty view or empty view template is enabled  (#24997)"

This reverts commit 763b6f5.

# Conflicts:
#	src/Controls/src/Core/Handlers/Items/iOS/ItemsViewController.cs
#	src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24966.cs

* - update testing

* Pending snapshots

* Windows snapshot

* Add conditional compilation for Windows tests

* - remove windows image

---------

Co-authored-by: Javier Suárez <javiersuarezruiz@hotmail.com>

Author: PureWeen

src/Controls/src/Core/Handlers/Items/ItemsViewHandler.Android.cs

@@ -109,24 +109,8 @@ void UpdateEmptyViewSize(double width, double height)
 
 			if (adapter is EmptyViewAdapter emptyViewAdapter)
 			{
-				var emptyView = emptyViewAdapter.EmptyView ?? emptyViewAdapter.EmptyViewTemplate;
-				Size size = Size.Zero;
-
-				IView view = emptyView as IView ?? (emptyView as DataTemplate)?.CreateContent() as IView;
-
-				if (view is not null)
-				{
-					if (view.Handler is null)
-					{
-						TemplateHelpers.GetHandler(view as View, this.MauiContext);
-					}
-
-					size = view.Measure(double.PositiveInfinity, double.PositiveInfinity);
-				}
-
-				var measuredHeight = !double.IsInfinity(size.Height) ? Context.ToPixels(size.Height) : height;
 				emptyViewAdapter.RecyclerViewWidth = width;
-				emptyViewAdapter.RecyclerViewHeight = measuredHeight > 0 ? measuredHeight : height;
+				emptyViewAdapter.RecyclerViewHeight = height;
 			}
 		}
 	}

src/Controls/src/Core/Handlers/Items/iOS/ItemsViewController.cs

@@ -538,13 +538,8 @@ protected virtual void RegisterViewTypes()
 
 		protected virtual CGRect DetermineEmptyViewFrame()
 		{
-			nfloat emptyViewHeight = CollectionView.Frame.Height;
-
-			if (_emptyViewFormsElement is IView emptyView)
-			{
-				emptyViewHeight = (nfloat)emptyView.Measure(CollectionView.Frame.Width, double.PositiveInfinity).Height;
-			}
-			return new CGRect(CollectionView.Frame.X, CollectionView.Frame.Y, CollectionView.Frame.Width, emptyViewHeight);
+			return new CGRect(CollectionView.Frame.X, CollectionView.Frame.Y,
+				CollectionView.Frame.Width, CollectionView.Frame.Height);
 		}
 
 		protected void RemeasureLayout(VisualElement formsElement)

src/Controls/src/Core/Handlers/Items/iOS/StructuredItemsViewController.cs

@@ -70,20 +70,15 @@ protected override CGRect DetermineEmptyViewFrame()
 			nfloat headerHeight = 0;
 			var headerView = CollectionView.ViewWithTag(HeaderTag);
 
-			if (headerView is not null)
+			if (headerView != null)
 				headerHeight = headerView.Frame.Height;
 
 			nfloat footerHeight = 0;
 			var footerView = CollectionView.ViewWithTag(FooterTag);
 
-			if (footerView is not null)
+			if (footerView != null)
 				footerHeight = footerView.Frame.Height;
 
-			var emptyView = CollectionView.ViewWithTag(EmptyTag);
-
-			if (emptyView is not null)
-				return base.DetermineEmptyViewFrame();
-
 			return new CGRect(CollectionView.Frame.X, CollectionView.Frame.Y, CollectionView.Frame.Width,
 				Math.Abs(CollectionView.Frame.Height - (headerHeight + footerHeight)));
 		}

src/Controls/tests/TestCases.Android.Tests/snapshots/android/CollectionViewEmptyViewFillsAvailableSpaceByDefault.png

@@ -0,0 +1,31 @@
+<?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="Maui.Controls.Sample.Issues.Issue27229"
+             xmlns:cv1="clr-namespace:Maui.Controls.Sample"
+             xmlns:local="clr-namespace:Maui.Controls.Sample.Issues"
+             x:Name="ThisMainPage"
+             Title="Main Page">
+      <CollectionView>
+        <CollectionView.EmptyView>
+            <ContentView>
+                <StackLayout HorizontalOptions="Center" VerticalOptions="Center">
+                    <Label
+                        Margin="10,25,10,10"
+                        FontAttributes="Bold"
+                        FontSize="18"
+                        HorizontalOptions="Fill"
+                        HorizontalTextAlignment="Center"
+                        AutomationId="ReadyToTest"
+                        Text="No results matched your filter." />
+                    <Label
+                        FontAttributes="Italic"
+                        FontSize="12"
+                        HorizontalOptions="Fill"
+                        HorizontalTextAlignment="Center"
+                        Text="Try a broader filter?" />
+                </StackLayout>
+            </ContentView>
+        </CollectionView.EmptyView>
+    </CollectionView>
+</ContentPage>

src/Controls/tests/TestCases.Android.Tests/snapshots/android/CollectionViewFooterMovestoBottomWithEmptyvieworEmptyviewTemplate.png

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+using System.Collections.Specialized;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 27229, "CollectionView, EmptyView Fills Available Space By Default")]
+	public partial class Issue27229
+	{
+		public Issue27229()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue24966.xaml

@@ -0,0 +1,23 @@
+#if TEST_FAILS_ON_WINDOWS
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	internal class Issue27229 : _IssuesUITest
+	{
+		public Issue27229(TestDevice device) : base(device) { }
+
+		public override string Issue => "CollectionView, EmptyView Fills Available Space By Default";
+
+		[Test]
+		[Category(UITestCategories.CollectionView)]
+		public void CollectionViewEmptyViewFillsAvailableSpaceByDefault()
+		{
+			App.WaitForElement("ReadyToTest");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif