[XAML] Make OnPlatform/OnIdiom markup extensions data-driven for custom backends#35901

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kubaflo wants to merge 3 commits into

dotnet:net11.0from

kubaflo:fix/35695-onplatform-onidiom-data-driven

Commits on Jun 12, 2026

[XAML] Make OnPlatform/OnIdiom markup extensions data-driven
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Address review: use Ordinal (case-sensitive) platform/idiom matching
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Commits on Jun 13, 2026

Address round-3 review: zero-allocation platform/idiom matching
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