Renaming only fails for DTE renames in CPS projects

See #30599

src/VisualStudio/IntegrationTest/IntegrationTests/Workspace/WorkspaceBase.cs

@@ -99,7 +99,7 @@ End Sub
             Assert.Equal("Sub Program.M(p As Object) (+ 1 overload)", VisualStudio.Editor.GetQuickInfo());
         }
 
-        [WpfFact(Skip = "https://github.com/dotnet/roslyn/issues/30599")]
+        [WpfFact]
         public void RenamingOpenFiles()
         {
             var project = new ProjectUtils.Project(ProjectName);
@@ -113,5 +113,20 @@ public void RenamingOpenFiles()
             // ...and after.
             Assert.Contains(ProjectName, VisualStudio.Editor.GetProjectNavBarItems());
         }
+
+        [WpfFact]
+        public virtual void RenamingOpenFilesViaDTE()
+        {
+            var project = new ProjectUtils.Project(ProjectName);
+            VisualStudio.SolutionExplorer.AddFile(project, "BeforeRename.cs", open: true);
+
+            // Verify we are connected to the project before...
+            Assert.Contains(ProjectName, VisualStudio.Editor.GetProjectNavBarItems());
+
+            VisualStudio.SolutionExplorer.RenameFileViaDTE(project, "BeforeRename.cs", "AfterRename.cs");
+
+            // ...and after.
+            Assert.Contains(ProjectName, VisualStudio.Editor.GetProjectNavBarItems());
+        }
     }
 }

src/VisualStudio/IntegrationTest/IntegrationTests/Workspace/WorkspacesNetCore.cs

@@ -59,5 +59,13 @@ public override void ProjectProperties()
             VisualStudio.SolutionExplorer.RestoreNuGetPackages(project);
             base.ProjectProperties();
         }
+
+        [WpfFact(Skip = "https://github.com/dotnet/roslyn/issues/30599")]
+        [Trait(Traits.Feature, Traits.Features.Workspace)]
+        [Trait(Traits.Feature, Traits.Features.NetCore)]
+        public override void RenamingOpenFilesViaDTE()
+        {
+            base.RenamingOpenFilesViaDTE();
+        }
     }
 }

src/VisualStudio/IntegrationTest/TestUtilities/InProcess/SolutionExplorer_InProc.cs

@@ -132,6 +132,17 @@ public string[] GetAssemblyReferences(string projectName)
         }
 
         public void RenameFile(string projectName, string oldFileName, string newFileName)
+        {
+            var project = GetProject(projectName);
+            var projectDirectory = Path.GetDirectoryName(project.FullName);
+
+            VsShellUtilities.RenameDocument(
+                ServiceProvider.GlobalProvider,
+                Path.Combine(projectDirectory, oldFileName),
+                Path.Combine(projectDirectory, newFileName));
+        }
+
+        public void RenameFileViaDTE(string projectName, string oldFileName, string newFileName)
         {
             var projectItem = GetProjectItem(projectName, oldFileName);
 

src/VisualStudio/IntegrationTest/TestUtilities/OutOfProcess/SolutionExplorer_OutOfProc.cs

@@ -121,6 +121,13 @@ public void RenameFile(ProjectUtils.Project project, string oldFileName, string
             _instance.Workspace.WaitForAsyncOperations(FeatureAttribute.Workspace);
         }
 
+        public void RenameFileViaDTE(ProjectUtils.Project project, string oldFileName, string newFileName)
+        {
+            // Wireup to open files can happen asynchronously in the case we're being notified of changes on background threads.
+            _inProc.RenameFileViaDTE(project.Name, oldFileName, newFileName);
+            _instance.Workspace.WaitForAsyncOperations(FeatureAttribute.Workspace);
+        }
+
         public void CloseFile(ProjectUtils.Project project, string fileName, bool saveFile)
             => _inProc.CloseFile(project.Name, fileName, saveFile);