Merge from vscode 1eb87b0e9ce9886afeaecec22b31abd0d9b7939f (#7282)

* Merge from vscode 1eb87b0e9ce9886afeaecec22b31abd0d9b7939f

* fix various icon issues

* fix preview features

src/vs/platform/ipc/node/simpleIpcProxy.ts

@@ -0,0 +1,48 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Event } from 'vs/base/common/event';
+import { IChannel, IServerChannel } from 'vs/base/parts/ipc/common/ipc';
+
+//
+// Use both `SimpleServiceProxyChannel` and `createSimpleChannelProxy`
+// for a very basic process <=> process communication over methods.
+//
+
+export class SimpleServiceProxyChannel implements IServerChannel {
+
+	private service: { [key: string]: unknown };
+
+	constructor(service: unknown) {
+		this.service = service as { [key: string]: unknown };
+	}
+
+	listen<T>(_: unknown, event: string): Event<T> {
+		throw new Error(`Events are currently unsupported by SimpleServiceProxyChannel: ${event}`);
+	}
+
+	call(_: unknown, command: string, args: any[]): Promise<any> {
+		const target = this.service[command];
+		if (typeof target === 'function') {
+			return target.apply(this.service, args);
+		}
+
+		throw new Error(`Method not found: ${command}`);
+	}
+}
+
+export function createSimpleChannelProxy<T>(channel: IChannel): T {
+	return new Proxy({}, {
+		get(_target, propKey, _receiver) {
+			if (typeof propKey === 'string') {
+				return function (...args: any[]) {
+					return channel.call(propKey, args);
+				};
+			}
+
+			throw new Error(`Unable to provide main channel proxy implementation for: ${String(propKey)}`);
+		}
+	}) as T;
+}