[API Proposal]: Expose `SymbolAnnotation.Create`

[Youssef1313]

Background and Motivation

Codefixes can usually annotate a TypeSyntax with AddImportsAnnotation so that the using directive is added automatically if not present. However, when the codefix suggests using an extension method, AddImportsAnnotation alone cannot work.

Proposed API

namespace Microsoft.CodeAnalysis.Simplification
{
-    internal class SymbolAnnotation
+    public class SymbolAnnotation
     {
         // Make everything internal except Create(ISymbol symbol) method
     }
}

Usage Examples

var annotation = SymbolAnnotation.Create(compilation.GetTypeByMetadataName("MyNamespace.Extensions"));
return document.WithSyntaxRoot(
    root.ReplaceNode(nodetoReplace, extensionInvocation.WithAdditionalAnnotations(Simplifier.AddImportsAnnotation, annotation)));

Alternative Designs

Risks