Add more information to dynamic file publish (#11267)

Author: Andrew Hall

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

@@ -101,7 +101,10 @@ public void PublishCSharp(ProjectKey projectKey, string filePath, SourceText sou
             ProjectKeyId = projectKey.Id,
             Changes = textChanges.Select(static t => t.ToRazorTextChange()).ToArray(),
             HostDocumentVersion = hostDocumentVersion,
-            PreviousWasEmpty = previouslyPublishedData.SourceText.Length == 0
+            PreviousWasEmpty = previouslyPublishedData.SourceText.Length == 0,
+            Checksum = Convert.ToBase64String(sourceText.GetChecksum().ToArray()),
+            ChecksumAlgorithm = sourceText.ChecksumAlgorithm,
+            SourceEncodingCodePage = sourceText.Encoding?.CodePage
         };
 
         _clientConnection.SendNotificationAsync(CustomMessageNames.RazorUpdateCSharpBufferEndpoint, request, CancellationToken.None).Forget();
@@ -145,7 +148,10 @@ public void PublishHtml(ProjectKey projectKey, string filePath, SourceText sourc
             ProjectKeyId = projectKey.Id,
             Changes = textChanges.Select(static t => t.ToRazorTextChange()).ToArray(),
             HostDocumentVersion = hostDocumentVersion,
-            PreviousWasEmpty = previouslyPublishedData.SourceText.Length == 0
+            PreviousWasEmpty = previouslyPublishedData.SourceText.Length == 0,
+            Checksum = Convert.ToBase64String(sourceText.GetChecksum().ToArray()),
+            ChecksumAlgorithm = sourceText.ChecksumAlgorithm,
+            SourceEncodingCodePage = sourceText.Encoding?.CodePage
         };
 
         _clientConnection.SendNotificationAsync(CustomMessageNames.RazorUpdateHtmlBufferEndpoint, request, CancellationToken.None).Forget();

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Protocol/UpdateBufferRequest.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
 using System.Text.Json.Serialization;
+using Microsoft.CodeAnalysis.Text;
 
 namespace Microsoft.CodeAnalysis.Razor.Protocol;
 
@@ -21,4 +22,13 @@ internal sealed class UpdateBufferRequest
 
     [JsonPropertyName("previousWasEmpty")]
     public bool PreviousWasEmpty { get; set; }
+
+    [JsonPropertyName("checksum")]
+    public required string Checksum { get; set; }
+
+    [JsonPropertyName("checksumAlgorithm")]
+    public SourceHashAlgorithm ChecksumAlgorithm { get; set; }
+
+    [JsonPropertyName("encodingCodePage")]
+    public int? SourceEncodingCodePage { get; set; }
 }

src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/LanguageClient/RazorCustomMessageTargetTest.cs

@@ -17,6 +17,7 @@
 using Microsoft.CodeAnalysis.Razor.Protocol.CodeActions;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
 using Microsoft.CodeAnalysis.Razor.Workspaces.Protocol.SemanticTokens;
+using Microsoft.CodeAnalysis.Text;
 using Microsoft.VisualStudio.LanguageServer.ContainedLanguage;
 using Microsoft.VisualStudio.LanguageServer.Protocol;
 using Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
@@ -71,7 +72,10 @@ public async Task UpdateCSharpBuffer_CannotLookupDocument_NoopsGracefully()
         var request = new UpdateBufferRequest()
         {
             HostDocumentFilePath = "C:/path/to/file.razor",
-            Changes = null
+            Changes = null,
+            Checksum = "",
+            ChecksumAlgorithm = SourceHashAlgorithm.Sha256,
+            SourceEncodingCodePage = null,
         };
 
         // Act & Assert
@@ -115,6 +119,9 @@ public async Task UpdateCSharpBuffer_UpdatesDocument()
             HostDocumentFilePath = "C:/path/to/file.razor",
             HostDocumentVersion = 1337,
             Changes = [],
+            Checksum = "",
+            ChecksumAlgorithm = SourceHashAlgorithm.Sha256,
+            SourceEncodingCodePage = null,
         };
 
         // Act
@@ -169,6 +176,9 @@ public async Task UpdateCSharpBuffer_UpdatesCorrectDocument()
             HostDocumentFilePath = "C:/path/to/file.razor",
             HostDocumentVersion = 1337,
             Changes = [],
+            Checksum = "",
+            ChecksumAlgorithm = SourceHashAlgorithm.Sha256,
+            SourceEncodingCodePage = null,
         };
 
         // Act