multi root - focus explorer after adding root

src/vs/workbench/browser/actions/fileActions.ts

@@ -13,6 +13,7 @@ import { ITelemetryData } from 'vs/platform/telemetry/common/telemetry';
 import { IWorkspaceContextService } from "vs/platform/workspace/common/workspace";
 import { IWorkspaceEditingService } from "vs/workbench/services/workspace/common/workspaceEditing";
 import URI from "vs/base/common/uri";
+import { IViewletService } from "vs/workbench/services/viewlet/browser/viewlet";
 
 export class OpenFolderAction extends Action {
 
@@ -60,7 +61,8 @@ export class AddRootFolderAction extends Action {
 		label: string,
 		@IWindowService private windowService: IWindowService,
 		@IWorkspaceContextService private contextService: IWorkspaceContextService,
-		@IWorkspaceEditingService private workspaceEditingService: IWorkspaceEditingService
+		@IWorkspaceEditingService private workspaceEditingService: IWorkspaceEditingService,
+		@IViewletService private viewletService: IViewletService
 	) {
 		super(id, label);
 	}
@@ -71,7 +73,9 @@ export class AddRootFolderAction extends Action {
 		}
 
 		return this.windowService.pickFolder({ buttonLabel: nls.localize('add', "Add") }).then(folders => {
-			return this.workspaceEditingService.addRoots(folders.map(folder => URI.file(folder)));
+			return this.workspaceEditingService.addRoots(folders.map(folder => URI.file(folder))).then(() => {
+				return this.viewletService.openViewlet(this.viewletService.getDefaultViewletId(), true);
+			});
 		});
 	}
 }