Stack overflow in ListView when changing SelectedItem to and from invalid value

[davidjohnoliver]

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

			var source = Enumerable.Range(0, 10).ToArray();
			var list = new ListView { ItemsSource = source };
			list.SelectedItem = 3;
			Assert.AreEqual(list.SelectedItem, 3);
			source[3] = 13;
			list.SelectedItem = 17;

Current behavior

Crashes with stack overflow from infinitely ping-ponging invalid SelectedItems

Expected behavior

Not so much crash

Environment

Nuget Package:

Package Version(s):

Affected platform(s):

• 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?

Internal issue: https://nventive.visualstudio.com/Umbrella/_workitems/edit/176790