Replacing the first item in a collection causes UniformGridLayout to reset all elements.

[jlaanstra]

When calling Vector->SetAt(0, ) on a collection bound to an ItemsRepeater with UniformGridLayout, all items get reloaded.

Steps to reproduce the bug
Download App6 from here https://github.com/jlaanstra/microsoft-ui-xaml/tree/user/jlaans/setatzero/test/App6

Expected behavior
The expected behavior would be that items don't get reset and the behavior is the same as SetAt(1).

Version Info
This repros on all OS version with the latest code from master. I can't test this with the 2.1 package because of other bugs.

Windows 10 version	Saw the problem?
Insider Build (18922)	Yes

Device form factor	Saw the problem?
Desktop	Yes

[msft-github-bot]

🎉This issue was addressed in #926, which has now been successfully released as Microsoft.UI.Xaml v2.2.190702001-prerelease.:tada:

Handy links:

• Release Notes
• Official Nuget Release