Back button doesnt work when going from normal page to databrowser

Tested on

Version 64.0.3282.167 (Official Build) Built on Ubuntu , running on Ubuntu 16.04 (64-bit)

To reproduce

Go to : https://drive.verborgh.org/public/yo/
Paste into browser : https://drive.verborgh.org/public/yo/data/yo.ttl

Expected behaviour

Browser should return back to https://drive.verborgh.org/public/yo/

Actual behaviour

Browser stays on : https://drive.verborgh.org/public/yo/data/yo.ttl

Diagnosis

Related code :

window.onpopstate = function(event) {
  window.document.outline.GotoSubject($rdf.sym(window.document.location.href), true, undefined, true, undefined)
}

Currently the assumption is that a previous page would also be called from the databrowser. It would be better if the onpopstate handler was more aware of the type of page that called it.

Start in index.js at the onpopstate handler linked in the issue, then reproduce the navigation from the normal page to the databrowser using the supplied URLs. Check how the handler treats history entries from outside the databrowser. Done means the browser back action returns from the data URL to the normal page as expected.