docs: autoscroll to anchor does not work on /api/ng

[jamesdaily]

When visiting http://docs.angularjs.org/api/ng#filter, the browser does not autoscroll the page to the anchor.

This functionality does work on other pages, such as http://docs.angularjs.org/api/angular.Module#methods_config (that anchor link causes the page to scroll to the anchor as expected.)

Note that if you first visit http://docs.angularjs.org/api/ng, and then append #filter to the URL and press enter, the page then scrolls to that anchor. Perhaps this bug has to do with how the content on the ng page is loaded as compared to other pages.

Possibly related issues (hopefully this one isn't a dupe): #4262 #2639

[petebacondarwin]

This should be fixed by this: #4758

[IgorMinar]

it's not fixed yet because ng-include doesn't wait for it's nested templates to instantiate before calling autoscroll.

we can't fix this in the framework now (we should in the future), so we should just fix the directive that generates the table of contents to call autoscroll on its own when its template arrives.

[IgorMinar]

this is the directive to fix: https://github.com/angular/angular.js/blob/master/docs/src/templates/js/docs.js?source=c#L210