Last modified: 2014-03-12 20:56:22 UTC
This might be complicated to solve and is wiki-specific, so I'm marking it as an enhancement for now. The English Wikipedia uses a /lot/ of locator maps, which are built by templates that overlay data to build the image (ref: https://en.wikipedia.org/wiki/Template:Location_map%2B). Media Viewer can't currently handle these image overlays properly, displaying only the "top" of the image (example: https://en.wikipedia.org/wiki/Template_talk:Geobox/test1). If this can be fixed, that would be wonderful.
I would say wait for https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/294 and the wontfix it. Full-screen overlay maps would not be terribly interesting, even if they were displayed properly; displaying them properly would mean showing two images on top of each other, which is a lot of work to do in a robust way (it took a long time to make the resizing, switching, preloading etc. of the image bug-free, now all that would have to be done again), and the whole thing would be very enwiki-specific, which is generally something to avoid. If card #294 gets implemented (which is straightforward), site admins can just blacklist the overlay maps so that the lightbox does not open when clicking on them. That's a bit inconsistent UX-wise, but probably unavoidable, there are even more evil images (like the maps which display text and markers via absolute CSS positioning) which we definitely want to blacklist.
