`Flyout.OverlayInputPassThroughElement` does not appear to work in WASM

[jsinsel-kahua]

Current behavior

Set up a button with a flyout with OverlayInputPassThroughElement set to the view. This way the user can click on another button even with the flyout open. This works in WinUI, but not in WASM.

Expected behavior

OverlayInputPassThroughElement works in WASM

How to reproduce it (as minimally and precisely as possible)

Attaching a repro. FlyoutPassThrough.zip

Workaround

No response

Works on UWP/WinUI

Yes

Environment

No response

NuGet package version(s)

No response

Affected platforms

No response

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

[ramezgerges]

This is due to the fact that FlyoutBase.OverlayInputPassThroughElement is not implemented in Uno yet. https://github.com/unoplatform/uno/blob/master/src/Uno.UI/Generated/3.0.0.0/Windows.UI.Xaml.Controls.Primitives/FlyoutBase.cs#L31C20

[ramezgerges]

https://github.com/unoplatform/uno/assets/66218781/31c8b8dc-f6ec-46ff-ac25-bde3870d5883

It seems only PointerPressed is passed through (on skia and wasm) while PointerMoved events (and others) are not. This blocks MenuBar's "cycling between menus" behaviour (see also https://github.com/unoplatform/uno/pull/13918, https://github.com/unoplatform/uno/pull/14290) which depends on OverlayPassthroughElement