Regression: `ApiBehaviorOptions.SuppressInferBindingSourcesForParameters` ignored (!!)

[dougbu]

Is this a Bug or Feature request?

Bug and a regression. Problem does not occur with ASP.NET Core 2.1 or earlier 2.2 previews (including Preview 3).

Steps to reproduce (preferably a link to a GitHub repo with a repro project)

1. start with https://github.com/dougbu/AspNetCoreModelBinderDemo This is a variant of https://github.com/BenjaminAbt/AspNetCoreModelBinderDemo, the repro for (closed) issue request ends in 400 when model binder success value is null #8636
2. set a breakpoint in MyPocoModelBinder.BindModelAsync(...)
3. run project in VS debugger

Expected

bindingContext.BindingSource == null

Actual

bindingContext.BindingSource == BindingSource.Path

Description of the problem

InferParameterBindingInfoConvention has a SuppressInferBindingSourcesForParameters property which is (correctly) set from ApiBehaviorOptions.SuppressInferBindingSourcesForParameters. But, the property is never read. Parameter binding sources are always inferred in controllers with [ApiController].

Version of Microsoft.AspNetCore.Mvc or Microsoft.AspNetCore.App or Microsoft.AspNetCore.All

Microsoft.AspNetCore.Mvc: 2.2.0-rtm-35541

[dougbu]

/cc @pranavkm

[dougbu]

My thanks to @BenjaminAbt for inspiring me to take a close look at the latest code in dotnet/AspNetCore.Docs#9175 discussions