am 2b9846d9: am f0093857: fix a couple bugs in sidenav for samples. Previously, clicking a link still invoked the expand collapse behavior. Previously, collapsing a parent item did not also collapse its children.

* commit '2b9846d9d1c075068d192f75f73f44896c95b7db':
  fix a couple bugs in sidenav for samples. Previously, clicking a link still invoked the expand collapse behavior. Previously, collapsing a parent item did not also collapse its children.