Fix Flyout memory leak

src/Controls/src/Core/FlyoutPage/FlyoutPage.cs

@@ -76,6 +76,7 @@ public Page Detail
 				{
 					previousDetail.SendNavigatedFrom(
 						new NavigatedFromEventArgs(destinationPage: value, NavigationType.Replace));
+					previousDetail.Handler?.DisconnectHandler();
 				}
 
 				_detail.SendNavigatedTo(new NavigatedToEventArgs(previousDetail, NavigationType.Replace));

src/Controls/tests/DeviceTests/Memory/MemoryTests.cs

@@ -89,9 +89,11 @@ void SetupBuilder()
 #if IOS || MACCATALYST
 				handlers.AddHandler<NavigationPage, NavigationRenderer>();
 				handlers.AddHandler<TabbedPage, TabbedRenderer>();
+				handlers.AddHandler<FlyoutPage, PhoneFlyoutPageRenderer>();
 #else
 				handlers.AddHandler<NavigationPage, NavigationViewHandler>();
 				handlers.AddHandler<TabbedPage, TabbedViewHandler>();
+				handlers.AddHandler<FlyoutPage, FlyoutViewHandler>();
 #endif
 			});
 		});
@@ -148,6 +150,52 @@ await CreateHandlerAndAddToWindow(new Window(navPage), async () =>
 		await AssertionExtensions.WaitForGC(references.ToArray());
 	}
 
+	#if ANDROID
+	[Fact("FlyoutPage Detail Navigation Does Not Leak")]
+	public async Task FlyoutPageDetailNavigationDoesNotLeak()
+	{
+		SetupBuilder();
+
+		var references = new List<WeakReference>();
+
+		var initialDetail = new NavigationPage(new ContentPage { Title = "Initial Detail" });
+
+		var flyoutPage = new FlyoutPage
+		{
+			Flyout = new ContentPage { Title = "Flyout" },
+			Detail = initialDetail
+		};
+
+		await CreateHandlerAndAddToWindow(new Window(flyoutPage), async () =>
+		{
+			for (int i = 0; i < 4; i++)
+			{
+				var detailPage = new ContentPage
+				{
+					Title = $"Detail {i}",
+					Content = new Label { Text = $"Content {i}" }
+				};
+				var navPage = new NavigationPage(detailPage);
+
+				flyoutPage.Detail = navPage;
+				flyoutPage.IsPresented = false;
+
+				await OnLoadedAsync(detailPage);
+
+				references.Add(new(detailPage));
+				references.Add(new(navPage));
+			}
+		});
+
+
+		// The last page will be alive and attached to the FlyoutPage
+		references.RemoveAt(references.Count - 1);
+		references.RemoveAt(references.Count - 1);
+
+		await AssertionExtensions.WaitForGC(references.ToArray());
+	}
+#endif
+
 	[Theory("Handler Does Not Leak")]
 	[InlineData(typeof(ActivityIndicator))]
 	[InlineData(typeof(Border))]

src/Core/src/Platform/Android/Navigation/NavigationViewFragment.cs

@@ -87,8 +87,11 @@ public override void OnResume()
 
 		public override void OnDestroy()
 		{
+			_fragmentContainerView?.RemoveView(_currentView);
+			_currentView?.RemoveFromParent();
 			_currentView = null;
 			_fragmentContainerView = null;
+			_navigationManager = null;
 
 			base.OnDestroy();
 		}

src/Core/src/Platform/Android/Navigation/StackNavigationManager.cs

@@ -496,7 +496,10 @@ void SetNavHost(NavHostFragment? navHost)
 				return;
 
 			if (_navHost is MauiNavHostFragment oldHost)
+			{
 				oldHost.StackNavigationManager = null;
+				oldHost.Dispose();
+			}
 
 			if (navHost is MauiNavHostFragment newHost)
 				newHost.StackNavigationManager = this;