src/vs/base/browser/ui/menu/menu.ts/Menu/setFocusedItem
class Menu:	private setFocusedItem(element: HTMLElement): void {
		for (let i = 0; i < this.actionsList.children.length; i++) {
			const elem = this.actionsList.children[i];
			if (element === elem) {
				this.focusedItem = i;
				break;
			}
		}
	}