Comment 9 for bug 1620635

I had a go writing a custom interface to allow thumbnailer to access the private files of another snap here:

https://github.com/snapcore/snapd/pull/2783

Unfortunately access to ~/snap/$name is also guarded by the "owner" modifier, so it suffers from the same problems as checking for access granted by the home interface. So this will be a problem on systems built on core as well as classic desktops.