Don't group by definition when presenting result for FindImplementations or GoToDef.

src/EditorFeatures/Core/FindReferences/FindReferencesCommandHandler.cs

@@ -126,7 +126,7 @@ private IStreamingFindUsagesPresenter GetStreamingPresenter()
                     // Let the presented know we're starging a search.  It will give us back
                     // the context object that the FAR service will push results into.
                     var context = presenter.StartSearch(
-                        EditorFeaturesResources.Find_References, alwaysShowDeclarations: false);
+                        EditorFeaturesResources.Find_References, canShowReferences: true);
                     await findUsagesService.FindReferencesAsync(document, caretPosition, context).ConfigureAwait(false);
 
                     // Note: we don't need to put this in a finally.  The only time we might not hit

src/EditorFeatures/Core/GoToDefinition/GoToDefinitionHelpers.cs

@@ -3,15 +3,12 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.InteropServices;
 using System.Threading;
-using Microsoft.CodeAnalysis.Editor.FindReferences;
 using Microsoft.CodeAnalysis.Editor.FindUsages;
 using Microsoft.CodeAnalysis.Editor.Host;
 using Microsoft.CodeAnalysis.FindSymbols;
 using Microsoft.CodeAnalysis.FindUsages;
 using Microsoft.CodeAnalysis.Navigation;
-using Microsoft.CodeAnalysis.Options;
 using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.Editor.GoToDefinition
@@ -75,8 +72,7 @@ internal static class GoToDefinitionHelpers
                 FindUsagesHelpers.GetDisplayName(symbol));
 
             return presenter.TryNavigateToOrPresentItemsAsync(
-                title, definitions.ToImmutableAndFree(),
-                alwaysShowDeclarations: true).WaitAndGetResult(cancellationToken);
+                title, definitions.ToImmutableAndFree()).WaitAndGetResult(cancellationToken);
         }
 
         private static IStreamingFindUsagesPresenter GetFindUsagesPresenter(

src/EditorFeatures/Core/GoToImplementation/GoToImplementationCommandHandler.cs

@@ -136,8 +136,7 @@ public void ExecuteCommand(GoToImplementationCommandArgs args, Action nextHandle
             var definitionItems = goToImplContext.GetDefinitions();
 
             streamingPresenter.TryNavigateToOrPresentItemsAsync(
-                goToImplContext.SearchTitle, definitionItems,
-                alwaysShowDeclarations: true).Wait(cancellationToken);
+                goToImplContext.SearchTitle, definitionItems).Wait(cancellationToken);
         }
 
         private IStreamingFindUsagesPresenter GetStreamingPresenter()

src/EditorFeatures/Core/Host/IStreamingFindReferencesPresenter.cs

@@ -21,7 +21,7 @@ internal interface IStreamingFindUsagesPresenter
         /// search completes <see cref="FindUsagesContext.OnCompletedAsync"/> should be called. 
         /// etc. etc.
         /// </summary>
-        FindUsagesContext StartSearch(string title, bool alwaysShowDeclarations);
+        FindUsagesContext StartSearch(string title, bool canShowReferences);
     }
 
     internal static class IStreamingFindUsagesPresenterExtensions
@@ -31,8 +31,8 @@ internal static class IStreamingFindUsagesPresenterExtensions
         /// items to the user.
         /// </summary>
         public static async Task<bool> TryNavigateToOrPresentItemsAsync(
-            this IStreamingFindUsagesPresenter presenter, string title, 
-            ImmutableArray<DefinitionItem> items, bool alwaysShowDeclarations)
+            this IStreamingFindUsagesPresenter presenter,
+            string title, ImmutableArray<DefinitionItem> items)
         {
             // Ignore any definitions that we can't navigate to.
             var definitions = items.WhereAsArray(d => d.CanNavigateTo());
@@ -66,7 +66,7 @@ internal static class IStreamingFindUsagesPresenterExtensions
                 // We have multiple definitions, or we have definitions with multiple locations.
                 // Present this to the user so they can decide where they want to go to.
 
-                var context = presenter.StartSearch(title, alwaysShowDeclarations);
+                var context = presenter.StartSearch(title, canShowReferences: false);
                 foreach (var definition in nonExternalItems)
                 {
                     await context.OnDefinitionFoundAsync(definition).ConfigureAwait(false);

src/VisualStudio/Core/Next/FindReferences/StreamingFindUsagesPresenter.DocumentLocationEntry.cs

@@ -27,39 +27,33 @@ namespace Microsoft.VisualStudio.LanguageServices.FindUsages
 {
     internal partial class StreamingFindUsagesPresenter
     {
-        private class DocumentSpanEntry : Entry
+        private abstract class AbstractDocumentSpanEntry : Entry
         {
-            private readonly TableDataSourceFindUsagesContext _context;
+            private readonly AbstractTableDataSourceFindUsagesContext _context;
 
             private readonly DocumentSpan _documentSpan;
-            private readonly bool _isDefinitionLocation;
             private readonly object _boxedProjectGuid;
-            private readonly SourceText _sourceText;
-            private readonly ClassifiedSpansAndHighlightSpan _classifiedSpans;
+            protected readonly SourceText _sourceText;
 
-            public DocumentSpanEntry(
-                TableDataSourceFindUsagesContext context,
+            protected AbstractDocumentSpanEntry(
+                AbstractTableDataSourceFindUsagesContext context,
                 RoslynDefinitionBucket definitionBucket,
                 DocumentSpan documentSpan,
-                bool isDefinitionLocation,
                 Guid projectGuid,
-                SourceText sourceText,
-                ClassifiedSpansAndHighlightSpan classifiedSpans)
+                SourceText sourceText)
                 : base(definitionBucket)
             {
                 _context = context;
 
                 _documentSpan = documentSpan;
-                _isDefinitionLocation = isDefinitionLocation;
                 _boxedProjectGuid = projectGuid;
                 _sourceText = sourceText;
-                _classifiedSpans = classifiedSpans;
             }
 
-            private StreamingFindUsagesPresenter Presenter => _context.Presenter;
+            protected StreamingFindUsagesPresenter Presenter => _context.Presenter;
 
-            private Document Document => _documentSpan.Document;
-            private TextSpan SourceSpan => _documentSpan.SourceSpan;
+            protected Document Document => _documentSpan.Document;
+            protected TextSpan SourceSpan => _documentSpan.SourceSpan;
 
             protected override object GetValueWorker(string keyName)
             {
@@ -81,6 +75,54 @@ protected override object GetValueWorker(string keyName)
 
                 return null;
             }
+        }
+
+        private class DefinitionItemEntry : AbstractDocumentSpanEntry
+        {
+            public DefinitionItemEntry(
+                AbstractTableDataSourceFindUsagesContext context, 
+                RoslynDefinitionBucket definitionBucket, 
+                DocumentSpan documentSpan, 
+                Guid projectGuid, 
+                SourceText sourceText) 
+                : base(context, definitionBucket, documentSpan, projectGuid, sourceText)
+            {
+            }
+
+            public override bool TryCreateColumnContent(string columnName, out FrameworkElement content)
+            {
+                if (columnName == StandardTableColumnDefinitions2.LineText)
+                {
+                    var inlines = DefinitionBucket.DefinitionItem.DisplayParts.ToInlines(Presenter._typeMap);
+                    var textBlock = inlines.ToTextBlock(Presenter._typeMap, wrap: false);
+
+                    content = textBlock;
+                    return true;
+                }
+
+                content = null;
+                return false;
+            }
+        }
+
+        private class DocumentSpanEntry : AbstractDocumentSpanEntry
+        {
+            private readonly bool _isDefinitionLocation;
+            private readonly ClassifiedSpansAndHighlightSpan _classifiedSpans;
+
+            public DocumentSpanEntry(
+                AbstractTableDataSourceFindUsagesContext context,
+                RoslynDefinitionBucket definitionBucket,
+                DocumentSpan documentSpan,
+                bool isDefinitionLocation,
+                Guid projectGuid,
+                SourceText sourceText,
+                ClassifiedSpansAndHighlightSpan classifiedSpans)
+                : base(context, definitionBucket, documentSpan, projectGuid, sourceText)
+            {
+                _isDefinitionLocation = isDefinitionLocation;
+                _classifiedSpans = classifiedSpans;
+            }
 
             public override bool TryCreateColumnContent(string columnName, out FrameworkElement content)
             {

src/VisualStudio/Core/Next/FindReferences/StreamingFindUsagesPresenter.RoslynDefinitionBucket.cs

@@ -17,13 +17,13 @@ internal partial class StreamingFindUsagesPresenter
         private class RoslynDefinitionBucket : DefinitionBucket, ISupportsNavigation
         {
             private readonly StreamingFindUsagesPresenter _presenter;
-            private readonly TableDataSourceFindUsagesContext _context;
+            private readonly AbstractTableDataSourceFindUsagesContext _context;
 
             public readonly DefinitionItem DefinitionItem;
 
             public RoslynDefinitionBucket(
                 StreamingFindUsagesPresenter presenter,
-                TableDataSourceFindUsagesContext context,
+                AbstractTableDataSourceFindUsagesContext context,
                 DefinitionItem definitionItem)
                 : base(name: definitionItem.DisplayParts.JoinText() + " " + definitionItem.GetHashCode(),
                        sourceTypeIdentifier: context.SourceTypeIdentifier,

src/VisualStudio/Core/Next/FindReferences/StreamingFindUsagesPresenter.cs

@@ -60,7 +60,7 @@ internal partial class StreamingFindUsagesPresenter :
             _vsFindAllReferencesService = (IFindAllReferencesService)_serviceProvider.GetService(typeof(SVsFindAllReferences));
         }
 
-        public FindUsagesContext StartSearch(string title, bool alwaysShowDeclarations)
+        public FindUsagesContext StartSearch(string title, bool canShowReferences)
         {
             this.AssertIsForeground();
 
@@ -68,8 +68,10 @@ public FindUsagesContext StartSearch(string title, bool alwaysShowDeclarations)
             var window = _vsFindAllReferencesService.StartSearch(title);
 
             // Make the data source that will feed data into this window.
-            var dataSource = new TableDataSourceFindUsagesContext(
-                this, window, alwaysShowDeclarations);
+
+            var dataSource = canShowReferences
+                ? (AbstractTableDataSourceFindUsagesContext)new WithReferencesFindUsagesContext(this, window)
+                : new WithoutReferencesFindUsagesContext(this, window);
 
             // And return the data source so that the FindRefs engine can report results
             // which the data source can then create the appropriate presentation items for