Navigation sidebar doesn't open child topics when viewing container topic

[crandmck]

The original implementation of the sidebar didn't allow sidebar container items to be linked to a topic. You can see the default implementation in http://idratherbewriting.com/documentation-theme-jekyll/: The sidebar container items "Overview", "Release Notes", "Installation", etc. are only containers, they are not pages themselves.

But since our topic hierarchy was laid out such that containers were also themselves topics, I changed the _includes/sidebar.html template to allow for that. However, the problem now is that when you click on a container topic, it doesn't "expand" the child topics; you have to click the inverted triangle to do that. While this works, it's inconvenient and could be confusing.

I'd like the child topics to be displayed by default. So, for example, when you click on LoopBack core concepts, I'd like it to expand the child topics underneath ("Routing", "LoopBack FAQ", etc) as well as display the "LoopBack core concepts" page.

[crandmck]

Fixed by e377bcc