VSCode merge (#4610)

* Merge from vscode e388c734f30757875976c7e326d6cfeee77710de

* fix yarn lcoks

* remove small issue

src/vs/workbench/api/browser/mainThreadFileSystemEventService.ts

@@ -0,0 +1,68 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { IDisposable, dispose } from 'vs/base/common/lifecycle';
+import { FileChangeType, IFileService, FileOperation } from 'vs/platform/files/common/files';
+import { extHostCustomer } from 'vs/workbench/api/common/extHostCustomers';
+import { ExtHostContext, FileSystemEvents, IExtHostContext } from '../common/extHost.protocol';
+import { ITextFileService } from 'vs/workbench/services/textfile/common/textfiles';
+
+@extHostCustomer
+export class MainThreadFileSystemEventService {
+
+	private readonly _listener = new Array<IDisposable>();
+
+	constructor(
+		extHostContext: IExtHostContext,
+		@IFileService fileService: IFileService,
+		@ITextFileService textfileService: ITextFileService,
+	) {
+
+		const proxy = extHostContext.getProxy(ExtHostContext.ExtHostFileSystemEventService);
+
+		// file system events - (changes the editor and other make)
+		const events: FileSystemEvents = {
+			created: [],
+			changed: [],
+			deleted: []
+		};
+		fileService.onFileChanges(event => {
+			for (let change of event.changes) {
+				switch (change.type) {
+					case FileChangeType.ADDED:
+						events.created.push(change.resource);
+						break;
+					case FileChangeType.UPDATED:
+						events.changed.push(change.resource);
+						break;
+					case FileChangeType.DELETED:
+						events.deleted.push(change.resource);
+						break;
+				}
+			}
+
+			proxy.$onFileEvent(events);
+			events.created.length = 0;
+			events.changed.length = 0;
+			events.deleted.length = 0;
+		}, undefined, this._listener);
+
+		// file operation events - (changes the editor makes)
+		fileService.onAfterOperation(e => {
+			if (e.operation === FileOperation.MOVE) {
+				proxy.$onFileRename(e.resource, e.target!.resource);
+			}
+		}, undefined, this._listener);
+
+		textfileService.onWillMove(e => {
+			const promise = proxy.$onWillRename(e.oldResource, e.newResource);
+			e.waitUntil(promise);
+		}, undefined, this._listener);
+	}
+
+	dispose(): void {
+		dispose(this._listener);
+	}
+}