[UWP CollectionView] Changing ItemsSource automatically selects first item

[jcmanke]

Description

When the ItemsSource of a CollectionView is changed, the first item in the new ItemsSource will automatically be selected. This only happens on UWP, not Android or iOS.

Steps to Reproduce

1. Run attached sample app.
2. Type into the SearchBar to dynamically filter the CollectionView ItemsSource.
3. See that the first item in the filtered list is automatically selected on UWP only.

Expected Behavior

Selection is cleared when ItemsSource changes.

Actual Behavior

First item is selected.

Basic Information

• Version with issue: Tested on 4.1.0, 4.2.0-pre3
• Last known good version: Unknown
• IDE: Visual Studio Enterprise 2019, version 16.2.0
• Platform Target Frameworks:
  • UWP: 16299

Reproduction Link

UWPCollectionViewAutoSelect.zip