ListView items don't show when NSTableView.SelectionDidChange handler added

[alataffective]

Description

When adding a SelectionDidChange event handler to the NSTableView returned by ListViewRenderer.NativeTableView, the list items no longer display.

Steps to Reproduce

1. Create a Xamarin.Forms application with a MacOS head.
2. Add a ListView and populate with items.
3. Run the application and see the items displayed.
4. Create a ListView effect.
5. In the MacOS implementation of the effect, add the following

    protected override void OnAttached()
    {
        var nativeTableView = ((ListViewRenderer)Container).NativeTableView;
        nativeTableView.SelectionDidChange += (sender, e) => { }; 
    }

Expected Behavior

No change.

Actual Behavior

The list items are no longer shown.

Basic Information

• Version with issue: 4.0.0.394984-pre10
• Platform Target Frameworks: MacOS

Screenshots

Without event handler

With event handler

Reproduction Link

https://github.com/alataffective/ListView-items-don-t-show-when-NSTableView.SelectionDidChange-handler-added

[jfversluis]

Taking into consideration the remaining lifetime of Xamarin.Forms, the platform this is about, the age of this issue and the traction this issue has seen I think it's unlikely that this will get fixed. If it is something that you still would like to have, please consider opening a PR. Thanks!