/**
* Add another Menu instance and combined the two
* Groups with the same name get combined, but
* inherit each other's items
*
* @param Menu $menu
*
* @return Menu $menu
*/
public function add(Menu $menu)
{
foreach ($menu->getGroups() as $group) {
if ($this->groups->has($group->getName())) {
$existingGroup = $this->groups->get($group->getName());
$group->hideHeading(!$group->shouldShowHeading());
foreach ($group->getItems() as $item) {
$existingGroup->addItem($item);
}
} else {
$this->addGroup($group);
}
}
return $this;
}
