For Blazor.WebView.Wpf, use application dispatcher

[SteveSandersonMS]

Fixes #32057

Previously we were nonsensically dispatching to the current thread's dispatcher, not the dispatcher for the UI thread. So it was always no-opping before.

[SteveSandersonMS]

@dotnet/aspnet-blazor-eng I think we might have some issue with the macOS CI builds. Recently we keep getting build errors from .razor files where it complains about syntax errors relating to syntaxes we've recently added (generic type inference and generic type constraints). Is it possible that macOS builds are incorrectly configured and use an outdated version of the SDK?

[captainsafia]

@dotnet/aspnet-blazor-eng I think we might have some issue with the macOS CI builds. Recently we keep getting build errors from .razor files where it complains about syntax errors relating to syntaxes we've recently added (generic type inference and generic type constraints). Is it possible that macOS builds are incorrectly configured and use an outdated version of the SDK?

Yeah....we're working on investigating this ATM.