Vscode merge (#4582)

* Merge from vscode 37cb23d3dd4f9433d56d4ba5ea3203580719a0bd

* fix issues with merges

* bump node version in azpipe

* replace license headers

* remove duplicate launch task

* fix build errors

* fix build errors

* fix tslint issues

* working through package and linux build issues

* more work

* wip

* fix packaged builds

* working through linux build errors

* wip

* wip

* wip

* fix mac and linux file limits

* iterate linux pipeline

* disable editor typing

* revert series to parallel

* remove optimize vscode from linux

* fix linting issues

* revert testing change

* add work round for new node

* readd packaging for extensions

* fix issue with angular not resolving decorator dependencies

src/vs/workbench/services/viewlet/browser/viewlet.ts

@@ -22,12 +22,12 @@ export interface IViewletService {
 	/**
 	 * Opens a viewlet with the given identifier and pass keyboard focus to it if specified.
 	 */
-	openViewlet(id: string, focus?: boolean): Promise<IViewlet | null>;
+	openViewlet(id: string | undefined, focus?: boolean): Promise<IViewlet | null>;
 
 	/**
 	 * Returns the current active viewlet or null if none.
 	 */
-	getActiveViewlet(): IViewlet;
+	getActiveViewlet(): IViewlet | null;
 
 	/**
 	 * Returns the id of the default viewlet.
@@ -37,7 +37,7 @@ export interface IViewletService {
 	/**
 	 * Returns the viewlet by id.
 	 */
-	getViewlet(id: string): ViewletDescriptor;
+	getViewlet(id: string): ViewletDescriptor | undefined;
 
 	/**
 	 * Returns all enabled viewlets
@@ -45,7 +45,17 @@ export interface IViewletService {
 	getViewlets(): ViewletDescriptor[];
 
 	/**
-	 *
+	 * Returns the progress indicator for the side bar.
 	 */
 	getProgressIndicator(id: string): IProgressService | null;
+
+	/**
+	 * Hide the active viewlet.
+	 */
+	hideActiveViewlet(): void;
+
+	/**
+	 * Return the last active viewlet id.
+	 */
+	getLastActiveViewletId(): string;
 }