Fix find refs

Author: CyrusNajmabadi

src/EditorFeatures/Test2/FindReferences/FindReferencesTests.ExtensionSymbols.vb

@@ -118,7 +118,7 @@ public static class MyExtension
 {
     extension(string $${|Definition:s|})
     {
-        public static int ExtensionMethod()
+        public int ExtensionMethod()
         {
             return [|s|].Length;
         }
@@ -143,9 +143,9 @@ public static class MyExtension
 {
     extension<$${|Definition:T|}>(string s)
     {
-        public static int ExtensionMethod([|T|] t)
+        public int ExtensionMethod([|T|] t)
         {
-            return [|s|].Length;
+            return s.Length;
         }
     }
 }

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

@@ -32,6 +32,8 @@ protected override Task DetermineDocumentsToSearchAsync<TData>(
         // parameter has a different name in different parts that we won't find it.  However,
         // this only happens in error situations.  It is not legal in C# to use a different
         // name for a type parameter in different parts.
-        return FindDocumentsAsync(project, documents, processResult, processResultData, cancellationToken, symbol.Name, symbol.ContainingType.Name);
+        return symbol.ContainingType is { IsExtension: true, ContainingType.Name: var staticClassName }
+            ? FindDocumentsAsync(project, documents, processResult, processResultData, cancellationToken, symbol.Name, staticClassName)
+            : FindDocumentsAsync(project, documents, processResult, processResultData, cancellationToken, symbol.Name, symbol.ContainingType.Name);
     }
 }