Exclude a function's defintion from its reference count

This change causes a function's definition to be excluded from its
reference count when showing reference CodeLenses.  This was causing a
function definition to show that it had "1 reference" when there were no
other references to it in the workspace.

Author: daviwil

src/PowerShellEditorServices.Host/CodeLens/ReferencesCodeLensProvider.cs

@@ -69,6 +69,7 @@ await editorSession.LanguageService.FindReferencesOfSymbol(
                     ? new Location[0]
                     : referencesResult
                         .FoundReferences
+                        .Where(r => NotReferenceDefinition(foundSymbol, r))
                         .Select(
                             r => new Location
                             {
@@ -94,6 +95,16 @@ await editorSession.LanguageService.FindReferencesOfSymbol(
                     ));
         }
 
+        private static bool NotReferenceDefinition(
+            SymbolReference definition,
+            SymbolReference reference)
+        {
+            return
+                definition.ScriptRegion.StartLineNumber != reference.ScriptRegion.StartLineNumber
+                || definition.SymbolType != reference.SymbolType
+                || !string.Equals(definition.SymbolName, reference.SymbolName, StringComparison.OrdinalIgnoreCase);
+        }
+
         private static string GetFileUri(string filePath)
         {
             // If the file isn't untitled, return a URI-style path