Clicking on NavigationView's NavigationViewItem chevron displays empty child list

[tflopez]

Describe the bug

When the NavigationView.PaneDisplayMode is set to Top, clicking on the expand/collapse chevron on a child NavigationViewItem with children displays a blank pane rather than a list of child items. Clicking on the NavigationViewItem's label or icon does show the list of children as expected. This is new behavior in Microsoft.WindowsAppSDK 1.5.240227000. Microsoft.WindowsAppSDK 1.4.240211001 shows the child list regardless of where you click in the child NavigationViewItem.

When the NavigationView.PaneDisplayMode is set to Left, clicking on the expand/collapse chevron does not expand the NavigationViewItem's node to display its children. Double-clicking on the chevron does expand the node, however.

Steps to reproduce the bug

1. Start the attached app
2. Click on the chevron next to the "Account" item
3. See the blank pane

TestApp.zip

Expected behavior

Clicking on the expand/collapse chevron on a NavigationViewItem with children will open and display its list of children.

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.5.0: 1.5.240227000

Windows version

Windows 11 (22H2): Build 22621, Windows 10 (21H2): Build 19044

Additional context

Thank you!

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

Closed similar issues:

• Binding an Empty Collection to MenuItemSource of NavigationViewItem still shows a Chevron (#2743), similarity score: 0.77
• Add a bit of padding to NavigationViewItem to avoid occluding expand/collapse chevron (#2287), similarity score: 0.71

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[codendone]

Fixed in the upcoming 1.5 servicing release.

[tflopez]

Thank you!