`ScrollViewer` weirdly propagates its `TemplatedParent` to its `Content`

[dr1rrb]

Current behavior

The ScrollViewer explicitly override the TemplatedParent of its Content in the ApplyScrollContentPresenterContent method.

If we remove this method, we might have a cyclic UI on iOS

Expected behavior

No patch

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

Cf. linked bugs of https://github.com/unoplatform/uno/pull/3738 and https://github.com/unoplatform/uno/pull/3763 (When starting the Gallery project at commit 932e368, the app is stuck on the splashscreen on iOS)

Environment

Nuget Package: Uno.UI Package Version(s): 3.0 Affected platform(s):

• [x] iOS
• [ ] Android
• [ ] WebAssembly
• [ ] WebAssembly renderers for Xamarin.Forms
• [ ] macOS
• [ ] Windows
• [ ] Build tasks
• [ ] Solution Templates

[MartinZikmund]

@morning4coffe-dev this may be fixed now with #17645 , can you check please?

[morning4coffe-dev]

@MartinZikmund This seems to be iOS specific, do I have any way to test this without it?

[MartinZikmund]

Not really, will check

[Xiaoy312]

The relevant code that propagates the templated-parent was removed in #17645.

Not sure about the original problem that required this behavior/workaround, but it is been half a year since TP rework was completed and there is no report of SV related issue. I would assume it is safe to close this now.