You should be able to navigate to items that are in generated code.

src/EditorFeatures/CSharpTest/NavigateTo/NavigateToTests.cs

@@ -840,8 +840,9 @@ public async Task DottedPattern7()
         }
 
         [WorkItem(1174255, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1174255")]
+        [WorkItem(8009, "https://github.com/dotnet/roslyn/issues/8009")]
         [Fact, Trait(Traits.Feature, Traits.Features.NavigateTo)]
-        public async Task NoNavigationToGeneratedFiles()
+        public async Task NavigateToGeneratedFiles()
         {
             using (var workspace = await TestWorkspace.CreateAsync(@"
 <Workspace>
@@ -860,7 +861,7 @@ namespace N
             {
                 public partial class C
                 {
-                    public void VisibleMethod_Not() { }
+                    public void VisibleMethod_Generated() { }
                 }
             }
         </Document>
@@ -876,7 +877,8 @@ public partial class C
                 var items = _aggregator.GetItems("VisibleMethod");
                 var expectedItems = new List<NavigateToItem>()
                 {
-                    new NavigateToItem("VisibleMethod", NavigateToItemKind.Method, "csharp", null, null, MatchKind.Exact, true, null)
+                    new NavigateToItem("VisibleMethod", NavigateToItemKind.Method, "csharp", null, null, MatchKind.Exact, true, null),
+                    new NavigateToItem("VisibleMethod_Generated", NavigateToItemKind.Method, "csharp", null, null, MatchKind.Prefix, true, null)
                 };
 
                 // The pattern matcher should match 'VisibleMethod' to both 'VisibleMethod' and 'VisibleMethod_Not', except that

src/EditorFeatures/Core/Extensibility/Navigation/NavigableItemFactory.cs

@@ -29,7 +29,8 @@ public static IEnumerable<INavigableItem> GetItemsFromPreferredSourceLocations(S
             return locations.Select(loc => GetItemFromSymbolLocation(solution, symbol, loc, displayString));
         }
 
-        public static IEnumerable<Location> GetPreferredSourceLocations(Solution solution, ISymbol symbol)
+        public static IEnumerable<Location> GetPreferredSourceLocations(
+            Solution solution, ISymbol symbol)
         {
             // Prefer non-generated source locations over generated ones.
 

src/EditorFeatures/Core/Implementation/NavigateTo/NavigateToSymbolFinder.cs

@@ -16,11 +16,10 @@ internal static class NavigateToSymbolFinder
     {
         internal static async Task<IEnumerable<ValueTuple<DeclaredSymbolInfo, Document, IEnumerable<PatternMatch>>>> FindNavigableDeclaredSymbolInfos(Project project, string pattern, CancellationToken cancellationToken)
         {
-            var generatedCodeRecognitionService = project.LanguageServices.WorkspaceServices.GetService<IGeneratedCodeRecognitionService>();
             var patternMatcher = new PatternMatcher(pattern);
 
             var result = new List<ValueTuple<DeclaredSymbolInfo, Document, IEnumerable<PatternMatch>>>();
-            foreach (var document in project.Documents.Where(d => !generatedCodeRecognitionService?.IsGeneratedCode(d) ?? true))
+            foreach (var document in project.Documents)
             {
                 cancellationToken.ThrowIfCancellationRequested();
                 var declaredSymbolInfos = await document.GetDeclaredSymbolInfosAsync(cancellationToken).ConfigureAwait(false);