Add WindowClientCapabilities

Author: Xanewok

client/src/progress.proposed.ts

@@ -15,9 +15,9 @@ export class WindowProgressFeature implements StaticFeature {
     constructor(private _client: BaseLanguageClient) {}
 
     public fillClientCapabilities(capabilities: ClientCapabilities): void {
-        capabilities.experimental = capabilities.experimental || {};
+        capabilities.experimental = capabilities.window || {};
         let windowProgressCapabilities = capabilities as Proposed.WindowProgressClientCapabilities;
-        windowProgressCapabilities.experimental.progress = true;
+        windowProgressCapabilities.window.progress = true;
     }
 
     public initialize(): void {

protocol/src/protocol.ts

@@ -650,6 +650,16 @@ export interface TextDocumentClientCapabilities {
 	};
 }
 
+/**
+ * Window specific client capabilities.
+ */
+export interface WindowClientCapabilities {
+    /**
+     * Whether client supports handling progress notifications.
+     */
+    progress?: boolean;
+}
+
 /**
  * Defines the capabilities provided by the client.
  */
@@ -664,6 +674,11 @@ export interface _ClientCapabilities {
 	 */
 	textDocument?: TextDocumentClientCapabilities;
 
+    /**
+     * Window specific client capabilities.
+     */
+    window?: WindowClientCapabilities;
+
 	/**
 	 * Experimental client capabilities.
 	 */