[regression/8.0.3] Exception on Focus command of SKCanvasView

[grigionicarlo]

Description

After upgrading to .NET MAUI 8 calling the Focus method of an SKCanvasView returns the exception "No result value was set.". The SKCanvasView component no longer receives focus even with keyboard navigation.

Steps to Reproduce

1. Create a File > New .NET MAUI App (MAUI 8)
2. Add SkiaSharp.Views.Maui.Controls NuGet Package
3. Add to MauiProgram.cs builder.UseSkiaSharp();
4. Change MainPage.xaml in:

<?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"
             xmlns:skia="clr-namespace:SkiaSharp.Views.Maui.Controls;assembly=SkiaSharp.Views.Maui.Controls"
             x:Class="Maui8Bug.MainPage">

    <ScrollView>
        <VerticalStackLayout
            Padding="30,0"
            Spacing="25">
            <Image
                Source="dotnet_bot.png"
                HeightRequest="185"
                Aspect="AspectFit"
                SemanticProperties.Description="dot net bot in a race car number eight" />

            <Label
                Text="Hello, World!"
                Style="{StaticResource Headline}"
                SemanticProperties.HeadingLevel="Level1" />

            <Label
                Text="Welcome to &#10;.NET Multi-platform App UI"
                Style="{StaticResource SubHeadline}"
                SemanticProperties.HeadingLevel="Level2"
                SemanticProperties.Description="Welcome to dot net Multi platform App U I" />

            <Button
                x:Name="CounterBtn"
                Text="Click me" 
                SemanticProperties.Hint="Counts the number of times you click"
                Clicked="OnCounterClicked"
                HorizontalOptions="Fill" />

            <skia:SKCanvasView x:Name="skia" />
        </VerticalStackLayout>
    </ScrollView>

</ContentPage>

5: Add skia.Focus(); to OnCounterClicked in MainPage.xaml.cs

When clicked Button raise Exception

Link to public reproduction project repository

No response

Version with bug

8.0.3

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

7.0.101

Affected platforms

Windows

Affected platform versions

Windows SDK 10.0.17763.0

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.

[XamlTest]

Verified this on Visual Studio Enterprise 17.9.0 Preview 2(8.0.3). Repro on Windows 11, Android 14.0-API34 and iOS 17.0 with below Project: MauiApp20.zip