TitleView causes memory leaks - fix

src/Controls/src/Core/NavigationPage/NavigationPage.cs

@@ -784,6 +784,10 @@ await Owner.SendHandlerUpdateAsync(animated,
 					{
 						Owner.RemoveFromInnerChildren(currentPage);
 						Owner.CurrentPage = newCurrentPage;
+						if (currentPage.TitleView != null)
+						{
+							currentPage.RemoveLogicalChild(currentPage.TitleView);
+						}
 					},
 					() =>
 					{

src/Controls/src/Core/Page/Page.cs

@@ -74,7 +74,7 @@ public partial class Page : VisualElement, ILayout, IPageController, IElementCon
 		bool _hasAppeared;
 		private protected bool HasAppeared => _hasAppeared;
 
-		View _titleView;
+		internal View TitleView;
 
 		List<Action> _pendingActions = new List<Action>();
 
@@ -494,8 +494,8 @@ protected override void OnBindingContextChanged()
 				SetInheritedBindingContext(menubarItem, BindingContext);
 			}
 
-			if (_titleView != null)
-				SetInheritedBindingContext(_titleView, BindingContext);
+			if (TitleView != null)
+				SetInheritedBindingContext(TitleView, BindingContext);
 		}
 
 		/// <summary>
@@ -798,7 +798,7 @@ public IPlatformElementConfiguration<T, Page> On<T>() where T : IConfigPlatform
 
 		internal void SetTitleView(View oldTitleView, View newTitleView)
 		{
-			_titleView = newTitleView;
+			TitleView = newTitleView;
 		}
 
 		internal bool HasNavigatedTo { get; private set; }

src/Controls/tests/DeviceTests/Elements/NavigationPage/NavigationPageTests.cs

@@ -332,6 +332,7 @@ await CreateHandlerAndAddToWindow<WindowHandlerStub>(new Window(navPage), async
 						new RadioButton(),
 					}
 				};
+				NavigationPage.SetTitleView(page, new Label() { Text = "Title View" });
 				pageReference = new WeakReference(page);
 				await navPage.Navigation.PushAsync(page);
 				await navPage.Navigation.PopAsync();