fix: Uno.Equality ambiguity with internal uno types

This workaround can be removed once [this type](574a441497/src/Uno.Foundation/Uno.Core.Extensions/Uno.Core.Extensions.Equality/IKeyEquatable.cs (L26)) has been renamed.

src/Uno.CodeGen/EqualityGenerator.cs

@@ -131,6 +131,8 @@ namespace Uno
 			_dataAnnonationsKeyAttributeSymbol = context.Compilation.GetTypeByMetadataName("System.ComponentModel.DataAnnotations.KeyAttribute");
 			_isPureAttributePresent = context.Compilation.GetTypeByMetadataName("System.Diagnostics.Contracts.Pure") != null;
 
+			ApplyWorkaroundForUnoEqualityAssembly(context);
+
 			_generateKeyEqualityCode = _iKeyEquatableSymbol != null;
 
 			foreach (var type in EnumerateEqualityTypesToGenerate())
@@ -139,6 +141,24 @@ namespace Uno
 			}
 		}
 
+		private void ApplyWorkaroundForUnoEqualityAssembly(SourceGeneratorContext context)
+		{
+			if (_iKeyEquatableSymbol == null && _iKeyEquatableGenericSymbol == null)
+			{
+				// Workaround for internal types duplicated in Uno.Foundation and other Uno assemblies
+				// causing context.Compilation.GetTypeByMetadataName to return null because of the ambiguity.
+
+				if (context.Compilation.ExternalReferences.FirstOrDefault(r => r.Display.EndsWith("Uno.Core.Extensions.Equality.dll", StringComparison.OrdinalIgnoreCase)) is MetadataReference equalityRef)
+				{
+					if (context.Compilation.GetAssemblyOrModuleSymbol(equalityRef) is IAssemblySymbol assemblySymbol)
+					{
+						_iKeyEquatableSymbol = assemblySymbol.GetTypeByMetadataName("Uno.Equality.IKeyEquatable");
+						_iKeyEquatableGenericSymbol = assemblySymbol.GetTypeByMetadataName("Uno.Equality.IKeyEquatable`1");
+					}
+				}
+			}
+		}
+
 		private void GenerateEquality(INamedTypeSymbol typeSymbol)
 		{
 			var builder = new IndentedStringBuilder();