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 'f009385738c8201e8a964a567acb59ee14fc2116':
  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.