On Wikimedia Commons, files are tracked for maintenance or internal purposes using hidden categories.
MultimediaViewer appears to display the first three categories based on the alphabetical order.
This results in displaying non-topical categories which do not make much sense. To give a few examples:
- FPs by creator/place/subject on https://www.mediawiki.org/wiki/Lightbox_demo#mediaviewer/File:Thyssen-Krupp-Quartier-Essen-Q1-2013.jpg
- License category on https://www.mediawiki.org/wiki/Lightbox_demo#mediaviewer/File:British%20Museum%20Great%20Court,%20London,%20UK%20-%20Diliff.jpg
- Maintenance category on https://www.mediawiki.org/wiki/Lightbox_demo#mediaviewer/File:Glenfinnan%20Site.jpg
The Gallerypreview Gadget (an older, similar attempt to enhance navigation) was working through this through a blacklist [1]. I think ignoring hidden categories is the quickest and safest way.
[1] https://commons.wikimedia.org/wiki/MediaWiki:Gadget-Gallerypreview.js
Version: unspecified
Severity: normal