Properly convert type to globals with namespace

Speckle.InterfaceGenerator/SymbolExtensions.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using Microsoft.CodeAnalysis;
@@ -7,46 +8,15 @@ namespace Speckle.InterfaceGenerator;
 
 internal static class SymbolExtensions
 {
-    private static readonly HashSet<string> _defaults = new() { "System", "Microsoft" };
     public static string GetNamespaceAndType(this ITypeSymbol typeSymbol)
     {
         if (typeSymbol is ITypeParameterSymbol t)
         {
             return t.Name;
         }
-        if (typeSymbol.SpecialType != SpecialType.None)
-        {
-            return typeSymbol.ToString();
-        }
-
-        if (typeSymbol.NullableAnnotation == NullableAnnotation.Annotated)
-        {
-            return typeSymbol.ToString();
-        }
-        var namespacez = new List<string>();
-        var ns = typeSymbol.ContainingNamespace;
-        while (ns is not null && !ns.IsGlobalNamespace)
-        {
-            namespacez.Insert(0, ns.Name);
-            ns = ns.ContainingNamespace;
-        }
-
-        if (namespacez.Any())
-        {
-            if (!_defaults.Contains(namespacez.First()))
-            {
-                var candidate = string.Join(".", namespacez);
-                var name = typeSymbol.ToString();
-                if (!name.StartsWith(candidate))
-                {
-                    name += candidate + "." + name;
-                }
-                return "global::" + name;
-            }
-        }
-
-        return typeSymbol.ToString();
+        return typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
     }
+
     public static bool TryGetAttribute(
         this ISymbol symbol,
         INamedTypeSymbol attributeType,