Thanks for the quick reply. I agree that working around the problem in
Nautilus would be awkward.

In comment #2 of the Shotwell bug #771757 there is some background info
taken from the upstream reports (and links to those reports). It seems
that the problem really is in gPhoto and Android.
https://bugs.launchpad.net/ubuntu/+source/shotwell/+bug/771757/comments/2

As per the upstream Shotwell bug, the Shotwell guys  believe that the
right place to fix it would be gPhoto, and hope that this will happen
(though there was some reluctance initially). If this is fixed in
gPhoto, Shotwell would behave automatically correct if it is
autolaunched for an SD card with images, if I read that right. (Though
don't know what would happen when the card has no or a nonstandard
camera folder).

I suppose this would then also reduce the problem for  Nautilus:
Nautilus could still show the button, but clicking it would make
Shotwell display only photos from the correct camera folder. Thus the
danger of damaging the data on the card is reduced.

I suppose the question then would just be when to show the button, and I
don't know how Nautilus does that now - though it seems that it's weird
how it currently offers the button for SD cards but not for USB sticks
with images. My impression is that this is based on historic accidents
(SD cards initially being mainly used in cameras) and is not reliable
anymore for non-expert users.

However, in bug #771757 Jim Nelson also says that if gPhoto does not fix
it, Shotwell will have to implement a workaround - and may do so by
having a configurable camera directory. In this case, Nautilus will have
to do something about it as well. Maybe it can know if Shotwell's camera
directory was already configured, and in this case show the Shotwell
button anyway. But if Shotwell is not configured, it may show an
explanation and offer an eog button or some other image viewer without
destructive options?

I know nothing of the internals of either application, and therefore I'm
mostly speaking from user perspective only.

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https://bugs.launchpad.net/bugs/860281

Title:
  Always showing "Open Shotwell" button for SD Card storage can be
  harmful

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