Fix some hardcoded values in cohosting

src/Razor/src/Microsoft.CodeAnalysis.Razor.CohostingShared/Diagnostics/CohostDocumentPullDiagnosticsEndpointBase.cs

@@ -22,13 +22,15 @@ namespace Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
 internal abstract class CohostDocumentPullDiagnosticsEndpointBase<TRequest, TResponse>(
     IRemoteServiceInvoker remoteServiceInvoker,
     IHtmlRequestInvoker requestInvoker,
+    IClientCapabilitiesService clientCapabilitiesService,
     ITelemetryReporter telemetryReporter,
     ILoggerFactory loggerFactory)
     : AbstractRazorCohostDocumentRequestHandler<TRequest, TResponse>
     where TRequest : notnull
 {
     private readonly IRemoteServiceInvoker _remoteServiceInvoker = remoteServiceInvoker;
     private readonly IHtmlRequestInvoker _requestInvoker = requestInvoker;
+    private readonly IClientCapabilitiesService _clientCapabilitiesService = clientCapabilitiesService;
     private readonly ITelemetryReporter _telemetryReporter = telemetryReporter;
     private readonly ILogger _logger = loggerFactory.GetOrCreateLogger<CohostDocumentPullDiagnosticsEndpointBase<TRequest, TResponse>>();
 
@@ -109,7 +111,8 @@ await razorDocument.Project.TryGetSourceGeneratedDocumentFromHintNameAsync(hintN
         _logger.LogDebug($"Getting C# diagnostics for {generatedDocument.FilePath}");
 
         using var _ = _telemetryReporter.TrackLspRequest(LspMethodName, "Razor.ExternalAccess", TelemetryThresholds.DiagnosticsSubLSPTelemetryThreshold, correletionId);
-        var diagnostics = await ExternalHandlers.Diagnostics.GetDocumentDiagnosticsAsync(generatedDocument, supportsVisualStudioExtensions: true, cancellationToken).ConfigureAwait(false);
+        var supportsVisualStudioExtensions = _clientCapabilitiesService.ClientCapabilities.SupportsVisualStudioExtensions;
+        var diagnostics = await ExternalHandlers.Diagnostics.GetDocumentDiagnosticsAsync(generatedDocument, supportsVisualStudioExtensions, cancellationToken).ConfigureAwait(false);
         return diagnostics.ToArray();
     }
 

src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/GoToImplementation/RemoteGoToImplementationService.cs

@@ -26,6 +26,8 @@ protected override IRemoteGoToImplementationService CreateService(in ServiceArgs
 
     protected override IDocumentPositionInfoStrategy DocumentPositionInfoStrategy => PreferAttributeNameDocumentPositionInfoStrategy.Instance;
 
+    private readonly IClientCapabilitiesService _clientCapabilitiesService = args.ExportProvider.GetExportedValue<IClientCapabilitiesService>();
+
     public ValueTask<RemoteResponse<LspLocation[]?>> GetImplementationAsync(
         JsonSerializableRazorPinnedSolutionInfoWrapper solutionInfo,
         JsonSerializableDocumentId documentId,
@@ -66,11 +68,13 @@ protected override IRemoteGoToImplementationService CreateService(in ServiceArgs
             .GetGeneratedDocumentAsync(cancellationToken)
             .ConfigureAwait(false);
 
+        var supportsVisualStudioExtensions = _clientCapabilitiesService.ClientCapabilities.SupportsVisualStudioExtensions;
+
         var locations = await ExternalHandlers.GoToImplementation
             .FindImplementationsAsync(
                 generatedDocument,
                 positionInfo.Position.ToLinePosition(),
-                supportsVisualStudioExtensions: true,
+                supportsVisualStudioExtensions,
                 cancellationToken)
             .ConfigureAwait(false);
 

src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/SignatureHelp/RemoteSignatureHelpService.cs

@@ -5,6 +5,7 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Remote;
 using Microsoft.CodeAnalysis.Remote.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Text;
@@ -20,6 +21,8 @@ protected override IRemoteSignatureHelpService CreateService(in ServiceArgs args
             => new RemoteSignatureHelpService(in args);
     }
 
+    private readonly IClientCapabilitiesService _clientCapabilitiesService = args.ExportProvider.GetExportedValue<IClientCapabilitiesService>();
+
     public ValueTask<LspSignatureHelp?> GetSignatureHelpAsync(JsonSerializableRazorPinnedSolutionInfoWrapper solutionInfo, JsonSerializableDocumentId documentId, Position position, CancellationToken cancellationToken)
         => RunServiceAsync(
             solutionInfo,
@@ -39,7 +42,8 @@ protected override IRemoteSignatureHelpService CreateService(in ServiceArgs args
 
         if (DocumentMappingService.TryMapToGeneratedDocumentPosition(codeDocument.GetCSharpDocument(), absoluteIndex, out var mappedPosition, out _))
         {
-            return await ExternalHandlers.SignatureHelp.GetSignatureHelpAsync(generatedDocument, mappedPosition, supportsVisualStudioExtensions: true, cancellationToken).ConfigureAwait(false);
+            var supportsVisualStudioExtensions = _clientCapabilitiesService.ClientCapabilities.SupportsVisualStudioExtensions;
+            return await ExternalHandlers.SignatureHelp.GetSignatureHelpAsync(generatedDocument, mappedPosition, supportsVisualStudioExtensions, cancellationToken).ConfigureAwait(false);
         }
 
         return null;

src/Razor/src/Microsoft.VisualStudio.LanguageServices.Razor/LanguageClient/Cohost/CohostDocumentPullDiagnosticsEndpoint.cs

@@ -11,6 +11,7 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor.Cohost;
 using Microsoft.CodeAnalysis.Razor.Logging;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Remote;
 using Microsoft.CodeAnalysis.Razor.Telemetry;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Settings;
@@ -28,9 +29,10 @@ internal sealed class CohostDocumentPullDiagnosticsEndpoint(
     IRemoteServiceInvoker remoteServiceInvoker,
     IHtmlRequestInvoker requestInvoker,
     IClientSettingsManager clientSettingsManager,
+    IClientCapabilitiesService clientCapabilitiesService,
     ITelemetryReporter telemetryReporter,
     ILoggerFactory loggerFactory)
-    : CohostDocumentPullDiagnosticsEndpointBase<VSInternalDocumentDiagnosticsParams, VSInternalDiagnosticReport[]>(remoteServiceInvoker, requestInvoker, telemetryReporter, loggerFactory), IDynamicRegistrationProvider
+    : CohostDocumentPullDiagnosticsEndpointBase<VSInternalDocumentDiagnosticsParams, VSInternalDiagnosticReport[]>(remoteServiceInvoker, requestInvoker, clientCapabilitiesService, telemetryReporter, loggerFactory), IDynamicRegistrationProvider
 {
     private readonly IRemoteServiceInvoker _remoteServiceInvoker = remoteServiceInvoker;
     private readonly IClientSettingsManager _clientSettingsManager = clientSettingsManager;

src/Razor/src/Microsoft.VisualStudioCode.RazorExtension/Endpoints/DocumentPullDiagnosticsEndpoint.cs

@@ -10,6 +10,7 @@
 using Microsoft.CodeAnalysis.ExternalAccess.Razor.Cohost;
 using Microsoft.CodeAnalysis.ExternalAccess.Razor.Features;
 using Microsoft.CodeAnalysis.Razor.Logging;
+using Microsoft.CodeAnalysis.Razor.Protocol;
 using Microsoft.CodeAnalysis.Razor.Remote;
 using Microsoft.CodeAnalysis.Razor.Telemetry;
 
@@ -25,9 +26,10 @@ namespace Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
 internal sealed class DocumentPullDiagnosticsEndpoint(
     IRemoteServiceInvoker remoteServiceInvoker,
     IHtmlRequestInvoker requestInvoker,
+    IClientCapabilitiesService clientCapabilitiesService,
     ITelemetryReporter telemetryReporter,
     ILoggerFactory loggerFactory)
-    : CohostDocumentPullDiagnosticsEndpointBase<DocumentDiagnosticParams, FullDocumentDiagnosticReport?>(remoteServiceInvoker, requestInvoker, telemetryReporter, loggerFactory), IDynamicRegistrationProvider
+    : CohostDocumentPullDiagnosticsEndpointBase<DocumentDiagnosticParams, FullDocumentDiagnosticReport?>(remoteServiceInvoker, requestInvoker, clientCapabilitiesService, telemetryReporter, loggerFactory), IDynamicRegistrationProvider
 {
     protected override string LspMethodName => Methods.TextDocumentDiagnosticName;
     protected override bool SupportsHtmlDiagnostics => false;

src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/Cohost/CohostDocumentPullDiagnosticsTest.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor;
+using Microsoft.AspNetCore.Razor.LanguageServer.Test;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.CodeAnalysis.Razor.Diagnostics;
 using Microsoft.CodeAnalysis.Razor.Telemetry;
@@ -159,7 +160,8 @@ private async Task VerifyDiagnosticsAsync(TestCode input, VSInternalDiagnosticRe
         var requestInvoker = new TestHtmlRequestInvoker([(VSInternalMethods.DocumentPullDiagnosticName, htmlResponse)]);
 
         var clientSettingsManager = new ClientSettingsManager([]);
-        var endpoint = new CohostDocumentPullDiagnosticsEndpoint(RemoteServiceInvoker, requestInvoker, clientSettingsManager, NoOpTelemetryReporter.Instance, LoggerFactory);
+        var clientCapabilitiesService = new TestClientCapabilitiesService(new VSInternalClientCapabilities { SupportsVisualStudioExtensions = true });
+        var endpoint = new CohostDocumentPullDiagnosticsEndpoint(RemoteServiceInvoker, requestInvoker, clientSettingsManager, clientCapabilitiesService, NoOpTelemetryReporter.Instance, LoggerFactory);
 
         var result = taskListRequest
             ? await endpoint.GetTestAccessor().HandleTaskListItemRequestAsync(document, ["TODO"], DisposalToken)