[Android] Draw() not called if GraphicsView is child of a ScrollView with Orientation different from Vertical

[riccardominato]

Description

If you put a GraphicsView inside a ScrollView and set Orientation to a value different from the default Vertical, the Draw() method of the IDrawable associated seems not to be called.

Steps to Reproduce

1. Create a new .NET MAUI app.
2. Edit the main page in this way.

MainPage.xaml

<?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="GraphicsViewInScrollView.MainPage">

    <!-- Set Orientation to a value different from Vertical -->
    <ScrollView
        Orientation="Both"
        BackgroundColor="LightGray">
        <GraphicsView
            x:Name="GraphicsView" />
    </ScrollView>

</ContentPage>

MainPage.xaml.cs

namespace GraphicsViewInScrollView;

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        GraphicsView.Drawable = new MyDrawable();
    }
}

3. Add this Drawable cs file.

MyDrawable.cs

namespace GraphicsViewInScrollView;

public class MyDrawable : IDrawable
{
    public void Draw(ICanvas canvas, RectF dirtyRect)
    {
        canvas.DrawString("Hello World", 0, 0, dirtyRect.Width, dirtyRect.Height, HorizontalAlignment.Left, VerticalAlignment.Top);
    }
}

---

Expected behavior

Actual behavior

Link to public reproduction project repository

https://github.com/Riccardo11/MauiIssues/tree/main/GraphicsViewInScrollView

Version with bug

8.0.0-rc.2.9373

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 13. Didn't test other Android versions.

Did you find any workaround?

Setting GraphicsView WidthRequest to a value.

<GraphicsView
    WidthRequest="500"
    x:Name="GraphicsView" />

Relevant log output

No response

[riccardominato]

I noticed that setting WidthRequest of GraphicsView to a value the problem doesn't appear.
Cannot say if this is really a bug, anyway it surely has a misleading behavior.

[XamlTest]

Verified this on Visual Studio Enterprise 17.8.0 Preview 5.0(8.0.0-rc.2.9373). Repro on Android 14.0-API34, not repro on Windows 11 and iOS 16.4 with below Project:
GraphicsViewInScrollView.zip