[UI Test] Create a new UITest for ModalPageMarginCorrectAfterKeyboardOpens

src/Controls/tests/TestCases.HostApp/Issues/Issue18961.xaml

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+<?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.Issue18961"
+             xmlns:local="clr-namespace:Maui.Controls.Sample">
+  <ContentPage.Resources>
+    <ResourceDictionary>
+
+      <Style TargetType="local:UITestEntry">
+        <Setter Property="IsCursorVisible" Value="False" />
+        <Setter Property="BackgroundColor" Value="LightGray" />
+        <Setter Property="Margin" Value="0, 12" />
+      </Style>
+
+    </ResourceDictionary>
+  </ContentPage.Resources>
+  <ScrollView
+        x:Name="TestScrollView"
+        AutomationId="TestScrollView">
+    <StackLayout
+            Padding="12">
+      <Label 
+            AutomationId="WaitForStubControl"
+            Text="Modal Page margin correct after Keyboard opens"/>
+      <!--
+            Add enough entries into the stack layout so that we can						
+            guarantee we'll have entries that would be covered by the keyboard
+      -->
+      <Button AutomationId="ScrollButton" Text="Scroll To End" Clicked="OnButtonClicked" />
+      <local:UITestEntry AutomationId="TestEntry1" Placeholder="First Entry" />
+      <local:UITestEntry AutomationId="TestEntry2" Placeholder="2" />
+      <local:UITestEntry AutomationId="TestEntry3" Placeholder="3" />
+      <local:UITestEntry AutomationId="TestEntry4" Placeholder="4" />
+      <local:UITestEntry AutomationId="TestEntry5" Placeholder="5" />
+      <local:UITestEntry AutomationId="TestEntry6" Placeholder="6" />
+      <local:UITestEntry AutomationId="TestEntry7" Placeholder="7" />
+      <local:UITestEntry AutomationId="TestEntry8" Placeholder="8" />
+      <local:UITestEntry AutomationId="TestEntry9" Placeholder="9" />
+      <local:UITestEntry AutomationId="TestEntry10" Placeholder="10" />
+      <local:UITestEntry AutomationId="TestEntry11" Placeholder="11" />
+      <local:UITestEntry AutomationId="TestEntry12" Placeholder="12" />
+      <local:UITestEntry AutomationId="TestEntry13" Placeholder="13" />
+      <local:UITestEntry AutomationId="TestEntry14" Placeholder="14" />
+      <local:UITestEntry AutomationId="TestEntry15" Placeholder="15" />
+      <local:UITestEntry AutomationId="TestEntry16" Placeholder="16" />
+      <local:UITestEntry AutomationId="TestEntry17" Placeholder="17" />
+      <local:UITestEntry AutomationId="TestEntry18" Placeholder="18" />
+      <local:UITestEntry AutomationId="TestEntry19" Placeholder="19" />
+      <local:UITestEntry AutomationId="TestEntry20" Placeholder="Last Entry" />
+    </StackLayout>
+  </ScrollView>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue18961.xaml.cs

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+using System;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 18961, "Modal Page margin correct after Keyboard opens", PlatformAffected.Android)]
+	public partial class Issue18961 : ContentPage
+	{
+		public Issue18961()
+		{
+			InitializeComponent();
+		}
+
+		async void OnButtonClicked(object sender, EventArgs args)
+		{
+			var scrollY = TestScrollView.Height;
+			await TestScrollView.ScrollToAsync(0, scrollY, false);
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18961.cs

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+#if ANDROID
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18961 : _IssuesUITest
+	{
+		const string ScrollButton = "ScrollButton";
+		const string LastEntry = "TestEntry20";
+
+		public Issue18961(TestDevice device) : base(device) { }
+
+		public override string Issue => "Modal Page margin correct after Keyboard opens";
+
+		[Test]
+		[Category(UITestCategories.Layout)]
+		public async Task ModalPageMarginCorrectAfterKeyboardOpens()
+		{
+			App.WaitForElement("WaitForStubControl");
+
+			// 1. Ensure that the keyboard is closed before we start.
+			App.DismissKeyboard();
+
+			// 2. Scroll to the end.
+			App.WaitForElement(ScrollButton);
+			App.Click(ScrollButton);
+			await Task.Delay(1000); // Wait for the scroll animation to finish.
+			App.ScrollDown("TestScrollView"); // Ensure that we are at the end of the scroll.
+
+			// 3. Focus latest Entry
+			App.WaitForElement(LastEntry);
+			App.EnterText(LastEntry, "test");
+			App.Click(LastEntry);
+			await Task.Delay(1000);
+
+			// 4. The keyboard has opened and the Entry have been translated above the keyboard.
+			App.Screenshot("The keyboard has opened and the Entry have been translated above the keyboard.");
+			VerifyScreenshot();
+
+			// 5. Close the keyboard to see if sizes adjust back.
+			App.DismissKeyboard();
+			await Task.Delay(1000);
+
+			// 6. Verify the latest Entry text.
+			var text = App.FindElement(LastEntry).GetText();
+			Assert.That(text, Is.EqualTo("test"));
+
+			// 7. Make sure that everything has returned to the initial size once the keyboard has closed.
+			App.Screenshot("Make sure that everything has returned to the initial size once the keyboard has closed.");
+		}
+	}
+}
+#endif