added missing WorkspaceEdit.DocumentChanges and TextDocumentEdit Models.

Author: david-driscoll

src/Lsp/Models/TextDocumentEdit.cs

@@ -0,0 +1,19 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace OmniSharp.Extensions.LanguageServer.Models
+{
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class TextDocumentEdit
+    {
+        /// <summary>
+        /// The text document to change.
+        /// </summary>
+        public VersionedTextDocumentIdentifier TextDocument { get; set; }
+
+        /// <summary>
+        /// The edits to be applied.
+        /// </summary>
+        public Container<TextEdit> Edits { get; set; }
+    }
+}

src/Lsp/Models/WorkspaceEdit.cs

@@ -11,6 +11,15 @@ public class WorkspaceEdit
         /// <summary>
         /// Holds changes to existing resources.
         /// </summary>
-        public IDictionary<Uri, IEnumerable<TextEdit>> Changes { get; set; } = new Dictionary<Uri, IEnumerable<TextEdit>>();
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+        public IDictionary<Uri, IEnumerable<TextEdit>> Changes { get; set; }
+        /// <summary>
+        /// An array of `TextDocumentEdit`s to express changes to n different text documents
+        /// where each text document edit addresses a specific version of a text document.
+        /// Whether a client supports versioned document edits is expressed via
+        /// `WorkspaceClientCapabilities.workspaceEdit.documentChanges`.
+        /// </summary>
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+        public Container<TextDocumentEdit> DocumentChanges { get; set; }
     }
-}
+}