[X] Make OnPlatformExtension and OnIdiomExtension trim-compatible #26119
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Description of Change
I revisited the
OnIdiomExtension
andOnPlatformExtension
based on customer feedback and I've realized the only trim-incompatible part of the code is creating default value for value types. This seems like a weird edge case and I believe we should throw so the developer fixes the XAML.This would be a breaking change though. If approved, this PR shouldn't be included in servicing releases.
Issues Fixed
Fixes #26115
/cc @StephaneDelcroix @PureWeen