Fix go to action on notebook toolbar (microsoft#208061)

src/vs/workbench/contrib/notebook/browser/media/notebookToolbar.css

@@ -70,6 +70,10 @@
 	display: inline-flex;
 }
 
+.monaco-workbench .notebook-action-view-item-unified .monaco-dropdown {
+	pointer-events: none;
+}
+
 .monaco-workbench .notebookOverlay .notebook-toolbar-container .monaco-action-bar .action-item .notebook-label {
 	background-size: 16px;
 	padding: 0px 5px 0px 2px;

src/vs/workbench/contrib/notebook/browser/view/cellParts/cellActionView.ts

@@ -3,18 +3,21 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { renderLabelWithIcons } from 'vs/base/browser/ui/iconLabel/iconLabels';
 import * as DOM from 'vs/base/browser/dom';
-import { IMenuEntryActionViewItemOptions, MenuEntryActionViewItem, SubmenuEntryActionViewItem } from 'vs/platform/actions/browser/menuEntryActionViewItem';
+import * as types from 'vs/base/common/types';
+import { EventType as TouchEventType } from 'vs/base/browser/touch';
 import { IActionViewItemProvider } from 'vs/base/browser/ui/actionbar/actionbar';
 import { IActionProvider } from 'vs/base/browser/ui/dropdown/dropdown';
+import { getDefaultHoverDelegate } from 'vs/base/browser/ui/hover/hoverDelegateFactory';
+import { ICustomHover, setupCustomHover } from 'vs/base/browser/ui/hover/updatableHoverWidget';
+import { renderLabelWithIcons } from 'vs/base/browser/ui/iconLabel/iconLabels';
+import { IAction } from 'vs/base/common/actions';
+import { ThemeIcon } from 'vs/base/common/themables';
+import { IMenuEntryActionViewItemOptions, MenuEntryActionViewItem, SubmenuEntryActionViewItem } from 'vs/platform/actions/browser/menuEntryActionViewItem';
 import { MenuItemAction, SubmenuItemAction } from 'vs/platform/actions/common/actions';
 import { IContextMenuService } from 'vs/platform/contextview/browser/contextView';
 import { IKeybindingService } from 'vs/platform/keybinding/common/keybinding';
 import { IThemeService } from 'vs/platform/theme/common/themeService';
-import { ThemeIcon } from 'vs/base/common/themables';
-import { ICustomHover, setupCustomHover } from 'vs/base/browser/ui/hover/updatableHoverWidget';
-import { getDefaultHoverDelegate } from 'vs/base/browser/ui/hover/hoverDelegateFactory';
 
 export class CodiconActionViewItem extends MenuEntryActionViewItem {
 
@@ -46,6 +49,7 @@ export class ActionViewWithLabel extends MenuEntryActionViewItem {
 export class UnifiedSubmenuActionView extends SubmenuEntryActionViewItem {
 	private _actionLabel?: HTMLAnchorElement;
 	private _hover?: ICustomHover;
+	private _primaryAction: IAction | undefined;
 
 	constructor(
 		action: SubmenuItemAction,
@@ -63,18 +67,30 @@ export class UnifiedSubmenuActionView extends SubmenuEntryActionViewItem {
 	override render(container: HTMLElement): void {
 		super.render(container);
 		container.classList.add('notebook-action-view-item');
+		container.classList.add('notebook-action-view-item-unified');
 		this._actionLabel = document.createElement('a');
 		container.appendChild(this._actionLabel);
 
 		this._hover = this._register(setupCustomHover(this.options.hoverDelegate ?? getDefaultHoverDelegate('element'), this._actionLabel, ''));
 
 		this.updateLabel();
+
+		for (const event of [DOM.EventType.CLICK, DOM.EventType.MOUSE_DOWN, TouchEventType.Tap]) {
+			this._register(DOM.addDisposableListener(container, event, e => this.onClick(e, true)));
+		}
+	}
+
+	override onClick(event: DOM.EventLike, preserveFocus = false): void {
+		DOM.EventHelper.stop(event, true);
+		const context = types.isUndefinedOrNull(this._context) ? this.options?.useEventAsContext ? event : { preserveFocus } : this._context;
+		this.actionRunner.run(this._primaryAction ?? this._action, context);
 	}
 
 	protected override updateLabel() {
 		const actions = this.subActionProvider.getActions();
 		if (this._actionLabel) {
 			const primaryAction = actions[0];
+			this._primaryAction = primaryAction;
 
 			if (primaryAction && primaryAction instanceof MenuItemAction) {
 				const element = this.element;