Comment 5 for bug 770126

I think I've partially solved this by updating the /usr/share/applications/nautilus.desktop file, and changing this line:

MimeType=inode/directory;application/x-gnome-saved-search;
to be:
MimeType=inode/directory;application/x-gnome-saved-search;x-scheme-handler/smb;x-scheme-handler/ssh;

Then running sudo update-desktop-database to update the file /usr/share/applications/mimeinfo.cache

Hat tip to the instructions here: http://jarrpa.net/2011/10/28/creating-custom-url-handlers-in-ubuntu-11-04-11-10-gnome-3-0/

I'm not certain that this entirely works (it's not quite deterministic), but I'll give the machine a rebot and see if its stuck.

This works because this patch was added:
http://bazaar.launchpad.net/~unity-team/unity-lens-applications/trunk/revision/202

This calls AppInfo.launch_default_for_uri (orig, null), which looks up the native gnome url handler.

Something that really isn't documented anywhere - to get debug output, find the program like so:

david@silver:~/unity-lens-applications-0.4.12$ ps axfu|grep lens
david 15396 0.0 0.6 206424 13268 ? Sl 01:04 0:03 /usr/lib/unity-lens-applications/unity-applications-daemon

Kill it and restart it, and then it will produce output like this:

david@silver:~/unity-lens-applications-0.4.12$ kill 15396
david@silver:~/unity-lens-applications-0.4.12$ /usr/lib/unity-lens-applications/unity-applications-daemon
(process:4185): unity-applications-daemon-DEBUG: daemon.vala:256: Building initial application menu

Leaving the program running, run the command that isn't working, and this will get outputted:

(process:4185): unity-applications-daemon-WARNING **: daemon.vala:744: Failed to launch URI ssh://throium