Changing Grid.Row does not update layout until window is resized

[spadapet]

Description

I could only repro on Windows (WinUI). For the main page, if a Grid.Row changes for a child of the root grid, layout is not updated. Resizing the window can trigger the layout update.

While Grid.Row may not change through code usually, it will often change using XAML Hot Reload as the page is being designed.

Steps to Reproduce

1. Download and open my test project from:
   • https://github.com/spadapet/maui_bugs/tree/main/GridRowChanges
   • If you clone the repo, it's: https://github.com/spadapet/maui_bugs.git
2. Open the project GridRowChanges.sln in VS.
3. Set debugger to Windows, then F5 to build and debug

4. Click the "Toggle Grid Row" button, which is supposed to move the green box into the top grid cell. Nothing happens with layout:

5. Resize the window, now layout is updated:

The second box should move as soon as the button is clicked, which happens on Android just fine.

Link to public reproduction project repository

https://github.com/spadapet/maui_bugs/tree/main/GridRowChanges

Version with bug

8.0.6

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net8.0-windows10.0.19041.0

Did you find any workaround?

Resize the window or create other changes that force a layout update

Relevant log output

No response

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.

[XamlTest]

Verified this on VS 17.10.0 Preview 2.0(8.0.7). Repro on Windows 11, not repro on Android 14.0-API34, iOS 17.2 and MacCatalyst with below Project:
GridRowChanges.zip