Popup Overlay Incorrect in Scale/Transform Scenarios -- Regression after 1.3.230724000

[cwhitlatch]

Describe the bug

If a parent container of a Popup implements a transform or changes scale, the overlay ignores and does not adjust size. Mouse over and click behavior will also be incorrect. The root issue appears to be a regression when ShouldConstrainToRootBounds was introduced. 1.3.230724000 and earlier work properly and overlay content is scaled/located correctly.

Sample app demonstrating the issue: PopupSizeIssue.zip

Steps to reproduce the bug

Wrap a combobox within a LayoutTransformControl with scaling applied.

Sample App: PopupSizeIssue.zip

Expected behavior

Popup overlay should be sized properly to the scale/transform applied.

Screenshots

Using Live Visual Tree will show the PopupBorder being sized correctly and the overlay being incorrect:

From the sample app, the incorrect layout:

And the correct layout if running 1.3.230724000 or earlier:

NuGet package version

WinUI 3 - Windows App SDK 1.5.1: 1.5.240311000

Windows version

Windows 11 (22H2): Build 22621

Additional context

All Popups exhibit this issue, regardless of where they are defined. ShouldConstrainToRootBounds True/False both exhibit the issue.

[gegao18]

Thanks for reporting this. We have a fix for this issue in WASDK 1.5.2.

Here's what I see in the repro app now: