Add mapped edits helper

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Extensions/IServiceCollectionExtensions.cs

@@ -183,6 +183,7 @@ public static void AddTextDocumentServices(this IServiceCollection services, Lan
         services.AddHandler<DocumentDidSaveEndpoint>();
 
         services.AddHandler<RazorMapToDocumentRangesEndpoint>();
+        services.AddHandler<RazorMapToDocumentEditsEndpoint>();
         services.AddHandler<RazorLanguageQueryEndpoint>();
     }
 

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Mapping/RangComparer.cs

@@ -0,0 +1,37 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using Microsoft.VisualStudio.LanguageServer.Protocol;
+
+namespace Microsoft.AspNetCore.Razor.LanguageServer.Mapping;
+
+internal class RangComparer : IComparer<Range>
+{
+    public static readonly RangComparer Instance = new();
+
+    public int Compare(Range? x, Range? y)
+    {
+        if (x is null)
+        {
+            return y is null ? 0 : 1;
+        }
+
+        if (y is null)
+        {
+            return -1;
+        }
+
+        if (x.Start.Line < y.Start.Line)
+        {
+            return -1;
+        }
+
+        if (x.Start.Line > y.Start.Line)
+        {
+            return 1;
+        }
+
+        return x.Start.Character - y.Start.Character;
+    }
+}