Expander Content With ItemsRepeater Rendering Bug

[wky214269273]

Describe the bug

I use the Expander control and encapsulate an itemsRepeater in Content to display a large amount of data (about a few hundred items). When I first expand the Expander control, the content can be displayed correctly, but when I fold it up and expand it again, it becomes a blank space that requires a mouse click or scroll to display. I guess it may be a virtualization issue that caused the rendering to fail. Is there a solution to this problem?

Steps to reproduce the bug

1、Create an Expander Control，And the content contains an ItemsRepeater
2、Fill a large amount datas in this ItemsRepeater
3、Expand the Control -> Collapsed Control -> Expand the Control

Expected behavior

ItemsRepeater can show data correctly

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.4.5: 1.4.240411001

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

[lhecker]

I just hit this bug while working on Windows Terminal. That was not the most pleasant surprise for sure! As a workaround I'm using a ListView inside my ScrollView now, which obviously is not a great alternative, but it does work (until this issue is fixed).