Ignore documents from projects that do not support EnC when calculati…

…ng active statements (#59839)

src/EditorFeatures/Test/EditAndContinue/EditAndContinueWorkspaceServiceTests.cs

@@ -3322,15 +3322,30 @@ public async Task ActiveStatements_SyntaxErrorOrOutOfSyncDocument(bool isOutOfSy
             }
         }
 
-        [Fact]
-        public async Task ActiveStatements_ForeignDocument()
+        [Theory]
+        [CombinatorialData]
+        public async Task ActiveStatements_ForeignDocument(bool withPath, bool designTimeOnly)
         {
             var composition = FeaturesTestCompositions.Features.AddParts(typeof(DummyLanguageService));
 
             using var _ = CreateWorkspace(out var solution, out var service, new[] { typeof(DummyLanguageService) });
 
-            var project = solution.AddProject("dummy_proj", "dummy_proj", DummyLanguageService.LanguageName);
-            var document = project.AddDocument("test", SourceText.From("dummy1"));
+            var project = solution.AddProject("dummy_proj", "dummy_proj", designTimeOnly ? LanguageNames.CSharp : DummyLanguageService.LanguageName);
+            var filePath = withPath ? Path.Combine(TempRoot.Root, "test") : null;
+
+            var documentInfo = DocumentInfo.Create(
+                DocumentId.CreateNewId(project.Id, "test"),
+                name: "test",
+                folders: Array.Empty<string>(),
+                sourceCodeKind: SourceCodeKind.Regular,
+                loader: TextLoader.From(TextAndVersion.Create(SourceText.From("dummy1"), VersionStamp.Create(), filePath)),
+                filePath: filePath,
+                isGenerated: false,
+                designTimeOnly: designTimeOnly,
+                documentServiceProvider: null);
+
+            var document = project.Solution.AddDocument(documentInfo).GetDocument(documentInfo.Id);
+
             solution = document.Project.Solution;
 
             var debuggingSession = await StartDebuggingSessionAsync(service, solution);
@@ -3350,6 +3365,12 @@ public async Task ActiveStatements_ForeignDocument()
 
             var baseSpans = await debuggingSession.GetBaseActiveStatementSpansAsync(solution, ImmutableArray.Create(document.Id), CancellationToken.None);
             Assert.Empty(baseSpans.Single());
+
+            // update solution:
+            solution = solution.WithDocumentText(document.Id, SourceText.From("dummy2"));
+
+            baseSpans = await debuggingSession.GetBaseActiveStatementSpansAsync(solution, ImmutableArray.Create(document.Id), CancellationToken.None);
+            Assert.Empty(baseSpans.Single());
         }
 
         [Fact, WorkItem(24320, "https://github.com/dotnet/roslyn/issues/24320")]

src/Features/Core/Portable/EditAndContinue/DebuggingSession.cs

@@ -621,6 +621,12 @@ public async ValueTask<ImmutableArray<ImmutableArray<ActiveStatementSpan>>> GetB
                         continue;
                     }
 
+                    if (!document.Project.SupportsEditAndContinue())
+                    {
+                        // document is in a project that does not support EnC
+                        continue;
+                    }
+
                     // Multiple documents may have the same path (linked file).
                     // The documents represent the files that #line directives map to.
                     // Documents that have the same path must have different project id.
@@ -643,6 +649,7 @@ public async ValueTask<ImmutableArray<ImmutableArray<ActiveStatementSpan>>> GetB
 
                     var newProject = solution.GetRequiredProject(projectId);
                     var analyzer = newProject.LanguageServices.GetRequiredService<IEditAndContinueAnalyzer>();
+
                     await foreach (var documentId in EditSession.GetChangedDocumentsAsync(oldProject, newProject, cancellationToken).ConfigureAwait(false))
                     {
                         cancellationToken.ThrowIfCancellationRequested();