Set menu item active without controller action

[yii-bot]

This issue has originally been reported by @titusvk at yiisoft/yii2#16808.
Moved here by @cebe.

---

What steps will reproduce the problem?

Bootstrap Nav Widget doesn't set active menu item status when url param has no action.

What is the expected result?

Maybe we can anticipate, the default action is index.

What do you get instead?

I'm not sure with the following solution:

    protected function isItemActive($item)
    {
        if (!$this->activateItems) {
            return false;
        }

        if (isset($item['url']) && is_array($item['url']) && isset($item['url'][0])) {
            $route = $item['url'][0];

            **if (strpos(ltrim($route, '/'), '/') === false)
            {
                $route .= '/index';
            }**

Additional info

Q	A
Yii version	2.0.?
PHP version
Operating system

[machour]

Duplicate of #209