Fix SafeArea adjustments

[PureWeen]

Description of Change

We initially had to revert this PR because of a conflict with ScrollView that was uncovered #24600

We recently vastly simplified the ScrollView control on iOS #26763 which looks to have fixed the issue we were running up against.

This PR relates to some issues found here #22476 when trying to layout a Button when it's inside a layout that is partly inside the safearea.

The problem we found is that the MauiView returns a size from SizeThatFits that doesn't include the SafeAreaInsets. The arrange pass insets its Bounds and passes this value to CrossPlatformArrange but the Bounds being used is the size of the children not including the SafeAreaInsets which means the bounds used for arranging is wrong.

You can see from the screenshots below that the VSL surrounding the the entry gets arranged incorrectly

Comparison

Given the following XAML

<ContentPage
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="Maui.Controls.Sample.MainPage"
    xmlns:local="clr-namespace:Maui.Controls.Sample"
    xmlns:ios="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;assembly=Microsoft.Maui.Controls"
    ios:Page.UseSafeArea="false"
    >
    <VerticalStackLayout x:Name="layout" Background="Purple" IgnoreSafeArea="False" VerticalOptions="Start" IsClippedToBounds="True" >
        <Entry x:Name="label" Background="Green" Text="Hello there"></Entry>
    </VerticalStackLayout>
</ContentPage>

Before

After

Issues Fixed

Fixes #24246

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

Files not reviewed (1)

• src/Controls/tests/TestCases.HostApp/Issues/Issue24246.xaml: Language not supported

Comments suppressed due to low confidence (2)

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue24246.cs:15

• The test case should verify that the layout adjusts correctly for the safe area insets. Add a test to check the visual layout to confirm that the safe area insets are applied correctly.

[Test]

src/Core/src/Platform/iOS/MauiView.cs:123

• Ensure that the new behavior for adjusting safe area insets in SizeThatFits is covered by tests.

if (RespondsToSafeArea() && widthConstraint >= 0 && heightConstraint >= 0)