[Desktop] DragStarting called on parent control rather than on child control

[kucint]

Current behavior

This bug is present only on Desktop Framework, WinAppSDK works fine.

Create an UIElement that contains another UIElement.

Both of them have DragStarting event handler attached.
Bug: When the child is being dragged, the parent's handler is called rather than child's one.

<Page x:Class="UnoDragStartingApp.MainPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:UnoDragStartingApp"
      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Frame
        BorderThickness="1"
        BorderBrush="Black"
        Background="LightCoral"
        Width="400"
        Height="300"
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        CanDrag="True"
        DragStarting="Frame_DragStarting">
        <Rectangle
            Fill="LightBlue"
            Stroke="Black"
            StrokeThickness="1"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Width="100"
            Height="80"
            CanDrag="True"
            DragStarting="Rectangle_DragStarting"/>
    </Frame>
</Page>

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
    }

    private void Frame_DragStarting(UIElement sender, DragStartingEventArgs args)
        => Debug.WriteLine("Frame_DragStarting");

    private void Rectangle_DragStarting(UIElement sender, DragStartingEventArgs args)
        => Debug.WriteLine("Rectangle_DragStarting");
}

I suppose, the same incorrect behavior is to be observed on others handlers like:

• DropCompleted
• DragEnter
• DragLeave
• PointerReleased
• ... other

Expected behavior

When the child element is being dragged, the child's handler shall be called rather than parent's one.

How to reproduce it (as minimally and precisely as possible)

MINIMAL REPRO PROJECT: UnoDragStartingApp.zip

STEPS TO REPRODUCE:

• run the App under Desktop Framework
• drag child element.
• observe that Frame_DragStarting method is called, expected Rectangle_DragStarting method is called

Workaround

No response

Works on UWP/WinUI

Yes

Environment

No response

NuGet package version(s)

"Uno.Sdk": "5.5.32"

Affected platforms

Skia (WPF)

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response