Request: Scroll to top in tab bar navigation

In Instagram, Twitter, and a number of other iOS apps, when you click on a menu button of the page you are currently on, the app will scroll back to the top of the screen.

It would be nice if there was an additional option in the attributes for "tabs" that allowed for "scroll_to_top": "true". If you tap on the current tab and this flag is enabled, instead of doing nothing as it does now, it would scroll to the top of the page.

From here:
http://forum.jasonette.com/t/scroll-to-top-action/450

Start by tracing the tab bar navigation and how the tabs attributes are read. Implement the requested behavior so tapping the current tab scrolls the page to the top only when scroll_to_top is enabled, then verify that other tab behavior remains unchanged.

Written by the indexing model from the issue text.