[Shotwell] Missing Photos don't rescan properly

[Roy Wiggins]

So, I'm having a problem in 0.14 under Ubuntu (and previous versions)- it
doesn't re-find missing photos properly.

If I start up Shotwell with my external drive unplugged, it (of course)
realizes it can't actually find the photos on it, and removes them. The
problem is, when I mount the drive, close shotwell and re-open it, it looks
like it's scanning to see if they've come back... and doesn't find any of
them, silently stops scanning and leaves me with an empty library. They
are, however, all there and visible to Nautilus, etc in the same place that
the extended information dialog says they should be.

I'd love to be able to simply turn off this feature, but I'd settle for the
re-scan to actually work and repatriate my photos. Can I flip a toggle in
the database "by hand' to mark them "present"? Right now my photos are all
in purgatory: present, but I can't do anything with them in Shotwell.
 Oddly, the "remove from library" button is *also* greyed out on the
'missing' photos.

P.S: My ~/.shotwell directory is... not there anymore, after upgrading to
0.14. Though my library seems to be still somewhere, because it knows about
all my missing photos. Where did it go?!