Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  21ba529db0e22809e0a39a5d54cd98fd7028024a

Display thumbnail placeholder ASAP

- Exposes file width and height through data attributes
- If the attributes are present, display the placeholder immediately

Change-Id: I3dfa80b02073984dc2d3d7784cb3744b7e4e2cc8
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/293