Default InvariantGlobalization in Xamarin Android

[eerhardt]

This allows for unnecessary code to be trimmed by default in an app. See dotnet/runtime#47999.

[jonathanpeppers]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jonpryor]

@eerhardt : why isn't $(InvariantGlobalization)=False the default in the first place? What are the ramifications of this change?

[eerhardt]

why isn't $(InvariantGlobalization)=False the default in the first place?

The behavior of $(InvariantGlobalization)=False is the default behavior of the runtime when $(InvariantGlobalization) isn't explicitly set. But we don't explicitly set this in the core SDK because this would not allow an end user set the environment variable to control this behavior, since the runtimeconfig.json value overrides the environment variable. In the core SDK, we only want the runtimeconfig.json setting set when the developer explicitly sets it.

What are the ramifications of this change?

For app models that are trimmed (Blazor WASM, Xamarin), this setting allows the code that is only used when $(InvariantGlobalization)=true to be trimmed from the app when it isn't being used. This isn't a substantial amount of code, but for Blazor WASM, it was 10 KB uncompressed and 3 KB .br compressed.

I made the same changes in Blazor WASM
dotnet/sdk#15770

And @marek-safar requested I make the same change to Xamarin.
xamarin/xamarin-macios#10598 (IOS change)

[radekdoulik]

Added do-not-merge to postpone until I measure the difference for the description message.

[radekdoulik]

Ah, but there will be no difference yet. We should bump net6 version too.

[radekdoulik]

I tried to measure it with 6.0.0-preview.1.21109.8, but that didn't contain the runtime change yet. So let's merge it without that information.