[iOS] `ListView` deadlock on `ListViewBaseSource.GetCell`

[jeromelaban]

Current behavior

The ListView Change height test in snapshots mode freezes the app in deadlock when invoking this method:

https://github.com/unoplatform/uno/blob/545dacd7199c16d2006469e011f7307f1abf76d4/src/Uno.UI/UI/Xaml/Controls/ListViewBase/ListViewBaseSource.iOS.cs#L211

with the following stack trace:

0x16 in ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper_IntPtr_IntPtr    C#
0x72 in UIKit.UICollectionView.DequeueReusableCell at /Library/Frameworks/Xamarin.iOS.framework/Versions/13.20.0.22/src/Xamarin.iOS/UIKit/UICollectionView.g.cs:202,5   C#
0x7A in Windows.UI.Xaml.Controls.ListViewBaseSource.GetCell at src\Uno.UI\UI\Xaml\Controls\ListViewBase\ListViewBaseSource.iOS.cs:211,5 C#

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

Run the samples automatically to SamplesApp.Windows_UI_Xaml_Controls.ListView.ListViewChangeHeight.

Nuget Package: 3.0-dev

Package Version(s):

Affected platform(s):

• [x] iOS
• [ ] Android
• [ ] WebAssembly
• [ ] WebAssembly renderers for Xamarin.Forms
• [ ] macOS
• [ ] Windows
• [ ] Build tasks
• [ ] Solution Templates

Visual Studio:

• [ ] 2017 (version: )
• [ ] 2019 (version: )
• [ ] for Mac (version: )

Relevant plugins:

• [ ] Resharper (version: )

Anything else we need to know?

[jeromelaban]

/cc @davidjohnoliver

[davidjohnoliver]

😬