[WIP] Fix custom TitleView overlapping shell content on iOS 26

[Copilot]

• Understand the iOS 26 TitleView issue
• Explore the codebase and locate Shell TitleView handling
• Fetch pr-reviewer agent
• Understand existing PR Fix TitleView covering content in iOS 26+ Shell #32337 by kubaflo
• Develop my own solution approach independently
• Compare with existing PR Fix TitleView covering content in iOS 26+ Shell #32337
• Choose the best solution (own or existing)
• Implement the solution
• Add test case for Issue32287
• Build and verify the implementation
• Run code review
• Run security scan (CodeQL)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Using custom TitleView in AppShell causes shell content to be covered in iOS 26</issue_title>
<issue_description>When using a custom view for the Shell's TitleView on iOS 26, the title view ends up covering the content Shell is currently displaying. See the below screenshot.

When in this state, the content cannot be interacted with.

This is using the base MAUI template with a slight modification to add a custom TItleView. Here's the AppShell.xaml.

<?xml version="1.0" encoding="UTF-8" ?>
<Shell
    x:Class="TitleViewIssue.AppShell"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:TitleViewIssue"
    Title="TitleViewIssue">
    
    <Shell.TitleView>
<!-- 
        This label covers the entire app and isn't contained in the title view itself.
        A workaround is to either set VerticalOptions="Center" or to give it an explicit
        HeightRequest, but neither are necessary pre-iOS 26.
-->
        <Label Text="I'm a custom title"
               FontSize="20"
               HorizontalTextAlignment="Center"
               VerticalTextAlignment="Center"/>
    </Shell.TitleView>

    <ShellContent
        Title="Home"
        ContentTemplate="{DataTemplate local:MainPage}"
        Route="MainPage" />

</Shell>

This same code doesn't have this issue when built with an older MAUI iOS workload targeting iOS 18.5.

A workaround I've found is to manually specify VerticalOptions="Center" or to set HeightRequest on the view inside <Shell.TitleView>.

Attached is a sample project that reproduces the issue.

TitleViewIssue.zip</issue_description>

<agent_instructions>Use the custom agent in .github/agents/pr-reviewer.md@pr-reviewer to review this pull request #32215 for issue #32287</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Using custom TitleView in AppShell causes shell content to be covered in iOS 26 #32287

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