Fixed-ToolBar-Visibility-FlyoutPage (#28209)

Author: prakashKannanSf3972

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

@@ -70,6 +70,18 @@ void OnPageAppearing(object sender, EventArgs e)
 			if (sender is not ContentPage cp)
 				return;
 
+			var pages = cp.GetParentPages();
+			Page previous = null;
+			foreach (var page in pages)
+			{
+				if (page is FlyoutPage fp)
+				{
+					if (fp.Flyout == cp || previous == fp.Flyout)
+						return;
+				}
+				previous = page;
+			}
+
 			_toolbarTracker.PagePropertyChanged -= OnPagePropertyChanged;
 			_currentPage = cp;
 			_currentNavigationPage = _currentPage.FindParentOfType<NavigationPage>();

src/Controls/tests/Core.UnitTests/FlyoutPageUnitTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Microsoft.Maui.Controls.Internals;
 using Microsoft.Maui.Devices;
 using Microsoft.Maui.Graphics;
@@ -463,6 +464,59 @@ public void FlyoutPageAppearingAndDisappearingPropagatesToDetail()
 			Assert.Equal(1, disappearing);
 			Assert.Equal(1, appearing);
 		}
+
+		[Theory]
+		[InlineData(0)]
+		[InlineData(1)]
+		[InlineData(2)]
+		[InlineData(3)]
+		public async Task VerifyToolbarButtonVisibilityWhenFlyoutReset(int depth)
+		{
+			ContentPage detailContentPage = new ContentPage();
+
+			Page flyout = new ContentPage()
+			{
+				Title = "Initial Flyout"
+			};
+
+			NavigationPage.SetHasNavigationBar(flyout, false);
+
+			var flyoutContentPage = flyout;
+
+			for (int i = 0; i < depth; i++)
+			{
+				flyout = new NavigationPage(flyout)
+				{
+					Title = "Flyout " + i
+				};
+			}
+
+			FlyoutPage flyoutPage = new FlyoutPage
+			{
+				Flyout = flyout,
+				Detail = new NavigationPage(detailContentPage)
+			};
+
+			_ = new TestWindow(flyoutPage);
+
+			Toolbar flyoutToolBar = flyoutPage.Toolbar;
+			Assert.True(flyoutToolBar.IsVisible);
+
+			if (depth >= 1)
+			{
+				var page = new ContentPage();
+				NavigationPage.SetHasNavigationBar(page, false);
+				await flyoutContentPage.Navigation.PushAsync(page);
+			}
+			else
+			{
+				var page = new ContentPage { Title = "Reborn Flyout" };
+				NavigationPage.SetHasNavigationBar(page, false);
+				flyoutPage.Flyout = new ContentPage { Title = "Reborn Flyout" };
+			}
+
+			Assert.True(flyoutToolBar.IsVisible);
+		}
 	}
 
 }