Restrict LanguageServer IVTs to a specific namespace (#10183)

Fixes #10096

`Microsoft.VisualStudio.Razor.LanguageServerClient` has a reference to
`Microsoft.AspNetCore.Razor.LanguageServer` along with
`InternalsVisibleTo` access. This is unavoidable because we currently
run the LanguageServer in-proc in VS when the LSP editor is active.
However, over time `LanguageServerClient` has relied on more and more
code in `LanguageServer`, which can cause `MS.ANC.Razor.LanguageServer`
to be loaded in VS when it shouldn't be. This change addresses this
issue by limiting the types that `LanguageServerClient` has access to.

Access is restricted using the `RestrictedInternalsVisibleToAttribute`,
which is already supported by
`Microsoft.CodeAnalysis.CSharp.BannedApiAnalyzers`. Other than adding
our own copy of this attribute and updating the `AssemblyInfo.cs` for
`MS.ANC.Razor.LanguageServer`, this change is entirely mechanical.
Essentially, I've just moved types around, and those types fall into two
categories:

1. Types that are needed to host the language server. These have been
moved to a `Microsoft.AspNetCore.Razor.LanguageServer.Hosting`
namespace, and IVT is restricted to that namespace.
2. Protocol types that are needed by both the client and server. These
have been moved to `MS.CA.Razor.Workspaces` and organized in a
`Protocol` folder.

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/BenchmarkClientCapabilitiesService.cs

@@ -3,7 +3,7 @@
 
 #nullable disable
 
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.Microbenchmarks.LanguageServer;

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorCodeActionsBenchmark.cs

@@ -9,12 +9,13 @@
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Razor.LanguageServer;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.LanguageServer.Protocol;

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorCompletionBenchmark.cs

@@ -8,10 +8,10 @@
 using System.Threading;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
-using Microsoft.AspNetCore.Razor.LanguageServer;
 using Microsoft.AspNetCore.Razor.LanguageServer.Completion;
 using Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.Microbenchmarks.Serialization;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.Logging;

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorDiagnosticsBenchmark.cs

@@ -11,12 +11,13 @@
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.CodeGeneration;
-using Microsoft.AspNetCore.Razor.LanguageServer;
 using Microsoft.AspNetCore.Razor.LanguageServer.Diagnostics;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol.Diagnostics;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.LanguageServer.Protocol;

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorLanguageServerBenchmarkBase.cs

@@ -9,6 +9,7 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.LanguageServer;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Telemetry;
 using Microsoft.CodeAnalysis;

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/Serialization/CompletionListSerializationBenchmark.cs

@@ -5,8 +5,8 @@
 using System.Text;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Razor.LanguageServer;
 using Microsoft.AspNetCore.Razor.LanguageServer.Completion;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.Completion;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.VisualStudio.LanguageServer.Protocol;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AbstractRazorDelegatingEndpoint.cs

@@ -5,12 +5,12 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.Telemetry;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.Extensions.Logging;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using StreamJsonRpc;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AdhocWorkspaceFactory.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Immutable;
 using Microsoft.AspNetCore.Razor.LanguageServer.Common;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Host;
 

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AutoInsert/AutoClosingTagOnAutoInsertProvider.cs

@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.Syntax;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.Extensions.Logging;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AutoInsert/CloseTextTagOnAutoInsertProvider.cs

@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Razor.Language.Legacy;
 using Microsoft.AspNetCore.Razor.Language.Syntax;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.Extensions.Logging;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AutoInsert/OnAutoInsertEndpoint.cs

@@ -7,13 +7,13 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.Logging;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Microsoft.VisualStudio.LanguageServer.Protocol;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/AutoInsert/PreferHtmlInAttributeValuesDocumentPositionStrategy.cs

@@ -6,7 +6,7 @@
 using Microsoft.AspNetCore.Razor.Language.Syntax;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.Extensions.Logging;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CapabilitiesManager.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
 using System;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.CommonLanguageServerProtocol.Framework;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/ClientConnection.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using StreamJsonRpc;
 

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/BaseDelegatedCodeActionResolver.cs

@@ -5,8 +5,9 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
+using Microsoft.CodeAnalysis.Razor.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/CSharp/CSharpCodeActionResolver.cs

@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
+
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;
 
 internal abstract class CSharpCodeActionResolver : BaseDelegatedCodeActionResolver

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/CSharp/DefaultCSharpCodeActionResolver.cs

@@ -8,9 +8,10 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/CSharp/UnformattedRemappingCSharpCodeActionResolver.cs

@@ -8,10 +8,11 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/CodeActionEndpoint.cs

@@ -10,16 +10,17 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.AspNetCore.Razor.Telemetry;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.Logging;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.Extensions.Logging;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using Newtonsoft.Json.Linq;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/Html/DefaultHtmlCodeActionResolver.cs

@@ -5,9 +5,10 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/Html/HtmlCodeActionResolver.cs

@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
+
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;
 
 internal abstract class HtmlCodeActionResolver : BaseDelegatedCodeActionResolver

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/Razor/CodeBlockService.cs

@@ -6,6 +6,7 @@
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.Syntax;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Text;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/Razor/ExtractToCodeBehindCodeActionResolver.cs

@@ -9,15 +9,16 @@
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.Intermediate;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
-using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Razor;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.AspNetCore.Razor.Utilities;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Formatting;
 using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using Newtonsoft.Json.Linq;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/Razor/GenerateMethodCodeActionResolver.cs

@@ -10,15 +10,15 @@
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.Components;
 using Microsoft.AspNetCore.Razor.LanguageServer.CodeActions.Models;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.AspNetCore.Razor.Utilities;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using Newtonsoft.Json.Linq;
 using CSharpSyntaxFactory = Microsoft.CodeAnalysis.CSharp.SyntaxFactory;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/CodeActions/RazorCodeActionContext.cs

@@ -4,6 +4,7 @@
 using System;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.CodeAnalysis.Text;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.CodeActions;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/ColorPresentation/ColorPresentationEndpoint.cs

@@ -4,18 +4,19 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Razor.LanguageServer.Common;
-using Microsoft.AspNetCore.Razor.LanguageServer.DocumentColor;
 using Microsoft.AspNetCore.Razor.LanguageServer.EndpointContracts;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
+using Microsoft.CodeAnalysis.Razor.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol.ColorPresentation;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.ColorPresentation;
 
-[RazorLanguageServerEndpoint(ColorPresentationMethodName)]
+using ColorPresentation = CodeAnalysis.Razor.Protocol.ColorPresentation.ColorPresentation;
+
+[RazorLanguageServerEndpoint(CustomMessageNames.ColorPresentationMethodName)]
 internal sealed class ColorPresentationEndpoint : IRazorRequestHandler<ColorPresentationParams, ColorPresentation[]>
 {
-    public const string ColorPresentationMethodName = "textDocument/colorPresentation";
-
     private readonly IClientConnection _clientConnection;
 
     public ColorPresentationEndpoint(IClientConnection clientConnection)

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/DelegatedCompletionItemResolver.cs

@@ -7,8 +7,9 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.LanguageServer.Formatting;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;
@@ -65,7 +66,7 @@ public DelegatedCompletionItemResolver(
             delegatedParams.Identifier,
             item,
             delegatedParams.ProjectedKind);
-        var resolvedCompletionItem = await _clientConnection.SendRequestAsync<DelegatedCompletionItemResolveParams, VSInternalCompletionItem?>(Common.LanguageServerConstants.RazorCompletionResolveEndpointName, delegatedResolveParams, cancellationToken).ConfigureAwait(false);
+        var resolvedCompletionItem = await _clientConnection.SendRequestAsync<DelegatedCompletionItemResolveParams, VSInternalCompletionItem?>(CodeAnalysis.Razor.Protocol.LanguageServerConstants.RazorCompletionResolveEndpointName, delegatedResolveParams, cancellationToken).ConfigureAwait(false);
 
         if (resolvedCompletionItem is not null)
         {
@@ -105,7 +106,7 @@ private async Task<VSInternalCompletionItem> PostProcessCompletionItemAsync(
             return resolvedCompletionItem;
         }
 
-        var formattingOptions = await _clientConnection.SendRequestAsync<TextDocumentIdentifierAndVersion, FormattingOptions?>(Common.LanguageServerConstants.RazorGetFormattingOptionsEndpointName, documentContext.Identifier, cancellationToken).ConfigureAwait(false);
+        var formattingOptions = await _clientConnection.SendRequestAsync<TextDocumentIdentifierAndVersion, FormattingOptions?>(CodeAnalysis.Razor.Protocol.LanguageServerConstants.RazorGetFormattingOptionsEndpointName, documentContext.Identifier, cancellationToken).ConfigureAwait(false);
         if (formattingOptions is null)
         {
             return resolvedCompletionItem;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/DelegatedCompletionListProvider.cs

@@ -9,9 +9,10 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Language.Syntax;
+using Microsoft.AspNetCore.Razor.LanguageServer.Hosting;
 using Microsoft.CodeAnalysis.Razor.DocumentMapping;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/DelegatedCompletionResponseRewriter.cs

@@ -4,7 +4,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/DesignTimeHelperResponseRewriter.cs

@@ -7,8 +7,8 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.PooledObjects;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using RazorSyntaxNode = Microsoft.AspNetCore.Razor.Language.Syntax.SyntaxNode;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/HtmlCommitCharacterResponseRewriter.cs

@@ -6,8 +6,8 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/Delegation/SnippetResponseRewriter.cs

@@ -6,7 +6,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
-using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 
 namespace Microsoft.AspNetCore.Razor.LanguageServer.Completion.Delegation;