add "Find in Workspace..." to mutli root context menu

fixes #31004

src/vs/workbench/parts/search/browser/search.contribution.ts

@@ -29,6 +29,7 @@ import { IViewletService } from 'vs/workbench/services/viewlet/browser/viewlet';
 import { KeyMod, KeyCode } from 'vs/base/common/keyCodes';
 import { ITree } from 'vs/base/parts/tree/browser/tree';
 import * as searchActions from 'vs/workbench/parts/search/browser/searchActions';
+import { Model } from 'vs/workbench/parts/files/common/explorerModel';
 import * as Constants from 'vs/workbench/parts/search/common/constants';
 import { registerContributions as replaceContributions } from 'vs/workbench/parts/search/browser/replaceContributions';
 import { registerContributions as searchWidgetContributions } from 'vs/workbench/parts/search/browser/searchWidget';
@@ -199,7 +200,11 @@ class ExplorerViewerActionContributor extends ActionBarContributor {
 	public hasSecondaryActions(context: any): boolean {
 		let element = context.element;
 
-		// Contribute only on file resources
+		// Contribute only on file resources and model (context menu for multi root)
+		if (element instanceof Model) {
+			return true;
+		}
+
 		let fileResource = explorerItemToFileResource(element);
 		if (!fileResource) {
 			return false;
@@ -212,9 +217,14 @@ class ExplorerViewerActionContributor extends ActionBarContributor {
 		let actions: IAction[] = [];
 
 		if (this.hasSecondaryActions(context)) {
-			let fileResource = explorerItemToFileResource(context.element);
+			let action: Action;
+			if (context.element instanceof Model) {
+				action = this._instantiationService.createInstance(searchActions.FindInWorkspaceAction);
+			} else {
+				let fileResource = explorerItemToFileResource(context.element);
+				action = this._instantiationService.createInstance(searchActions.FindInFolderAction, fileResource.resource);
+			}
 
-			let action = this._instantiationService.createInstance(searchActions.FindInFolderAction, fileResource.resource);
 			action.order = 55;
 			actions.push(action);
 

src/vs/workbench/parts/search/browser/searchActions.ts

@@ -240,6 +240,21 @@ export class CloseReplaceAction extends Action {
 	}
 }
 
+export class FindInWorkspaceAction extends Action {
+
+	public static ID = 'filesExplorer.findInWorkspace';
+
+	constructor( @IViewletService private viewletService: IViewletService) {
+		super(FindInWorkspaceAction.ID, nls.localize('findInWorkspace', "Find in Workspace..."));
+	}
+
+	public run(event?: any): TPromise<any> {
+		return this.viewletService.openViewlet(Constants.VIEWLET_ID, true).then((viewlet: SearchViewlet) => {
+			viewlet.searchInFolder(null);
+		});
+	}
+}
+
 export class FindInFolderAction extends Action {
 
 	public static ID = 'filesExplorer.findInFolder';
@@ -247,7 +262,7 @@ export class FindInFolderAction extends Action {
 	private resource: URI;
 
 	constructor(resource: URI, @IInstantiationService private instantiationService: IInstantiationService) {
-		super(FindInFolderAction.ID, nls.localize('findInFolder', "Find in Folder"));
+		super(FindInFolderAction.ID, nls.localize('findInFolder', "Find in Folder..."));
 
 		this.resource = resource;
 	}

src/vs/workbench/parts/search/browser/searchViewlet.ts

@@ -839,7 +839,7 @@ export class SearchViewlet extends Viewlet {
 	public searchInFolder(resource: URI): void {
 		let folderPath = null;
 		const workspace = this.contextService.getWorkspace();
-		if (workspace) {
+		if (workspace && resource) {
 			if (workspace.roots.length === 1) {
 				// Show relative path from the root for single-root mode
 				folderPath = paths.relative(workspace.roots[0].fsPath, resource.fsPath);