Attached is a smaller set of test songs. None of these have an empty
artist or album tag, and all of them contain cover art. The problem
still shows up with your test qml, Victor.

None of these songs produce errors, so we can rule out the error
handling as the culprit.

What I'm seeing is that the list resets to the beginning whenever there
is a miss on the cache. It's easy to see this by following the
thumbnailer log and scrolling down very slowly. Things work exactly up
to the point where the first miss is encountered.

But, whether we have a miss or a hit at the service end makes no
difference to the client, other than the amount of time it takes for the
request to complete. (Hits and misses are indistinguishable to the
client). I've verified that we are returning the correct image data on
the client side after both hits and and misses.

I wonder whether there is a collation problem of some kind, or whether
it is possible for the association of which request goes with what list
item to get messed up somehow?

** Attachment added: "testsongs.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/thumbnailer/+bug/1542175/+attachment/4566614/+files/testsongs.tar.gz

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https://bugs.launchpad.net/bugs/1542175

Title:
  Problems and crashes with local music collection

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