am ac2fbe85: am f1d5a3b1: 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 'ac2fbe8507f7295681a528e6858a0fb6676f7324':
  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.