fix some tests with check on menubar parent

Author: adolgachev

src/cdk/menu/menu-bar.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import {AfterContentInit, Directive} from '@angular/core';
+import {inject, AfterContentInit, Directive, ElementRef} from '@angular/core';
 import {
   DOWN_ARROW,
   ESCAPE,
@@ -16,6 +16,7 @@ import {
   TAB,
   UP_ARROW,
 } from '../keycodes';
+import {_getEventTarget} from '../platform';
 import {takeUntil} from 'rxjs/operators';
 import {CdkMenuGroup} from './menu-group';
 import {CDK_MENU} from './menu-interface';
@@ -43,6 +44,8 @@ import {CdkMenuBase} from './menu-base';
   ],
 })
 export class CdkMenuBar extends CdkMenuBase implements AfterContentInit {
+  private readonly _elementRef: ElementRef<HTMLElement> = inject(ElementRef);
+
   /** The direction items in the menu flow. */
   override readonly orientation = 'horizontal';
 
@@ -65,7 +68,9 @@ export class CdkMenuBar extends CdkMenuBase implements AfterContentInit {
       case DOWN_ARROW:
       case LEFT_ARROW:
       case RIGHT_ARROW:
-        if (!hasModifierKey(event)) {
+        const target = _getEventTarget(event) as HTMLElement;
+
+        if (!hasModifierKey(event) && target.parentElement === this._elementRef.nativeElement) {
           const horizontalArrows = event.keyCode === LEFT_ARROW || event.keyCode === RIGHT_ARROW;
           // For a horizontal menu if the left/right keys were clicked, or a vertical menu if the
           // up/down keys were clicked: if the current menu is open, close it then focus and open the