Fix spelling mistake. Add a 'none' kind to HighlightKind to indicate you want...

Fix spelling mistake.  Add a 'none' kind to HighlightKind to indicate you want the default highlighting for the span.

src/EditorFeatures/Core/Implementation/ReferenceHighlighting/AbstractDocumentHighlightsService.cs

@@ -154,7 +154,7 @@ private bool ShouldConsiderSymbol(ISymbol symbol)
 
                 foreach (var referenceLocation in reference.Locations)
                 {
-                    var referenceKind = referenceLocation.IsWrittenTo ? HighlightSpanKind.WrittenReference : HighlightSpanKind.ReadReference;
+                    var referenceKind = referenceLocation.IsWrittenTo ? HighlightSpanKind.WrittenReference : HighlightSpanKind.Reference;
                     await AddLocationSpan(referenceLocation.Location, solution, spanSet, tagMap, referenceKind, cancellationToken).ConfigureAwait(false);
                 }
             }
@@ -162,7 +162,7 @@ private bool ShouldConsiderSymbol(ISymbol symbol)
             // Add additional references
             foreach (var location in additionalReferences)
             {
-                await AddLocationSpan(location, solution, spanSet, tagMap, HighlightSpanKind.ReadReference, cancellationToken).ConfigureAwait(false);
+                await AddLocationSpan(location, solution, spanSet, tagMap, HighlightSpanKind.Reference, cancellationToken).ConfigureAwait(false);
             }
 
             var list = new List<DocumentHighlights>(tagMap.Count);

src/EditorFeatures/Core/Implementation/ReferenceHighlighting/IDocumentHighlightsService.cs

@@ -13,8 +13,9 @@ namespace Microsoft.CodeAnalysis.Editor
 {
     internal enum HighlightSpanKind
     {
+        None,
         Definition,
-        ReadReference,
+        Reference,
         WrittenReference,
     }
 

src/EditorFeatures/Core/Implementation/ReferenceHighlighting/ReferenceHighlightingViewTaggerProvider.TagProducer.cs

@@ -134,9 +134,12 @@ private static AbstractNavigatableReferenceHighlightingTag GetTag(HighlightSpan
                 {
                     case HighlightSpanKind.WrittenReference:
                         return WrittenReferenceHighlightTag.Instance;
+
                     case HighlightSpanKind.Definition:
                         return DefinitionHighlightTag.Instance;
-                    case HighlightSpanKind.ReadReference:
+
+                    case HighlightSpanKind.Reference:
+                    case HighlightSpanKind.None:
                     default:
                         return ReferenceHighlightTag.Instance;
                 }

src/EditorFeatures/Test2/ReferenceHighlighting/CSharpReferenceHighlightingTests.vb

@@ -539,5 +539,26 @@ class C
             VerifyHighlights(input)
         End Sub
 
+        <Fact, Trait(Traits.Feature, Traits.Features.ReferenceHighlighting)>
+        Public Sub TestWrittenReference2()
+            Dim input =
+            <Workspace>
+                <Project Language="C#" CommonReferences="true">
+                    <Document>
+class C
+{
+    void M()
+    {
+        int {|Definition:$$y|};
+        int x = {|WrittenReference:y|} = 7;
+    }
+}
+                    </Document>
+                </Project>
+            </Workspace>
+
+            VerifyHighlights(input)
+        End Sub
+
     End Class
 End Namespace

src/Workspaces/Core/Portable/FindSymbols/FindReferences/Finders/AbstractReferenceFinder.cs

@@ -515,8 +515,8 @@ protected static bool IdentifiersMatch(ISyntaxFactsService syntaxFacts, string n
                         var alias = FindReferenceCache.GetAliasInfo(semanticFacts, semanticModel, token, cancellationToken);
 
                         var location = token.GetLocation();
-                        var isWrittemTo = semanticFacts.IsWrittenTo(semanticModel, token.Parent, cancellationToken);
-                        locations.Add(new ReferenceLocation(document, alias, location, isImplicit: false, isWrittenTo: isWrittemTo, candidateReason: match.Item2));
+                        var isWrittenTo = semanticFacts.IsWrittenTo(semanticModel, token.Parent, cancellationToken);
+                        locations.Add(new ReferenceLocation(document, alias, location, isImplicit: false, isWrittenTo: isWrittenTo, candidateReason: match.Item2));
                     }
                 }
             }