[Android] PopToRootAsync for modal pages - improvements

src/Controls/src/Core/Platform/ModalNavigationManager/ModalNavigationManager.Android.cs

@@ -119,7 +119,17 @@ Task<Page> PopModalPlatformAsync(bool animated)
 			}
 			else
 			{
-				dialogFragment.Dismiss();
+				// When batch-dismissing modals (e.g., PopToRoot), use DismissNow() to
+				// remove the fragment synchronously. This prevents intermediate modals
+				// from briefly flashing on screen between sequential pops.
+				bool isBatchPopping = _window.Page is Shell shell
+					&& shell.CurrentItem?.CurrentItem?.IsPoppingModalStack == true;
+
+				if (isBatchPopping)
+					dialogFragment.DismissNow();
+				else
+					dialogFragment.Dismiss();
+
 				source.TrySetResult(modal);
 			}
 

src/Controls/tests/TestCases.HostApp/Issues/Issue26846.cs

@@ -0,0 +1,40 @@
+namespace Maui.Controls.Sample.Issues;
+[Issue(IssueTracker.Github, 26846, "Shell PopToRootAsync doesn't happen instantly - previous pages flash quickly", PlatformAffected.Android)]
+public class Issue26846 : TestShell
+{
+	protected override void Init()
+	{
+		AddContentPage(new ContentPage()
+		{
+			Content = new VerticalStackLayout
+			{
+				Children =
+				{
+					new Label { Text = "This is a modal page1" },
+					new Button { Text = "Open modal page2", AutomationId="OpenModalPage2", Command = new Command(async () => await Navigation.PushModalAsync(new ContentPage()
+						{
+							Content = new VerticalStackLayout
+							{
+								Children = {
+									new Label { Text = "This is a modal page2" },
+									new Button { Text = "Open modal page3",  AutomationId="OpenModalPage3", Command = new Command(async () => await Navigation.PushModalAsync(new ContentPage()
+									{
+										Content = new VerticalStackLayout
+										{
+											Children = {
+												new Label { Text = "This is a modal page3" },
+												new Button { Text = "Close",  AutomationId="CloseModalPage3", Command = new Command(async () => await Navigation.PopModalAsync(false)) },
+												new Button { Text = "PopRoot", AutomationId="PopRootPage3", Command = new Command(async () => await Navigation.PopToRootAsync(false)) },
+												new Button { Text = "PopRoot Animated", AutomationId="PopRootPage4", Command = new Command(async () => await Navigation.PopToRootAsync()) }
+											}
+										}
+									})) },
+									new Button { Text = "Close", AutomationId="CloseModalPage2", Command = new Command(async () => await Navigation.PopModalAsync(false)) }
+								}
+							}
+						})) },
+				}
+			}
+		});
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue26846.cs

@@ -0,0 +1,43 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+public class Issue26846 : _IssuesUITest
+{
+	public Issue26846(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "Shell PopToRootAsync doesn't happen instantly - previous pages flash quickly";
+
+	[Test]
+	[Category(UITestCategories.Navigation)]
+	public void ModalPoppingShouldWorkOneByOne()
+	{
+		App.WaitForElement("OpenModalPage2");
+		App.Click("OpenModalPage2");
+		App.WaitForElement("OpenModalPage3");
+		App.Click("OpenModalPage3");
+		App.WaitForElement("CloseModalPage3");
+		App.Click("CloseModalPage3");
+		App.WaitForElement("CloseModalPage2");
+		App.Click("CloseModalPage2");
+
+		App.WaitForElement("OpenModalPage2");
+	}
+
+	[Test]
+	[Category(UITestCategories.Navigation)]
+	public void PopToRootShouldDismissAllModalsInstantly()
+	{
+		App.WaitForElement("OpenModalPage2");
+		App.Click("OpenModalPage2");
+		App.WaitForElement("OpenModalPage3");
+		App.Click("OpenModalPage3");
+		App.WaitForElement("PopRootPage3");
+		App.Click("PopRootPage3");
+
+		App.WaitForElement("OpenModalPage2");
+	}
+}