src/vs/base/browser/ui/menu/menu.ts/SubmenuMenuActionViewItem/dispose
class SubmenuMenuActionViewItem:	override dispose(): void {
		super.dispose();

		this.hideScheduler.dispose();

		if (this.mysubmenu) {
			this.mysubmenu.dispose();
			this.mysubmenu = null;
		}

		if (this.submenuContainer) {
			this.submenuContainer = undefined;
		}
	}