We have had this method in all Repo subclasses for a while, but sadly
it never got used and we've unintentionally crippled foreign DB repos
for some time now.
{{fixed}}
Change-Id: I972eb739cdd56c666981d5fbc371fa53024ff359
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/217
When the lightbox is opened, or prev/next pressed, preloads the
previous/next N images.
Technical debt introduced:
* initialization is a mess, with the viewer and the interface
randomly setting properties on each other in different phases of
execution. That got in the way and I shuffled things around
until they worked, which is obviously not the way to have a
robust system, but hopefully it will get scrapped soon anyway
in favor of a clean top-down dependency injection.
Change-Id: Idcb5c40de1ac0b3e482decd66e56c4de8ec71b6b
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/155
