====== How to reproduce: ======
1. Upload a pic multiple times to create a history
2. Open DokuWiki's new Media Manager (example.com/?do=media) and select the pic
3. Click on the history tab and select two versions
====== Expected result ======
"Show differences between selected revisions" button gets enabled.
====== Current result ("Bug") ======
"Show differences between selected revisions" button stays disabled (cf. attached
screenshot).
====== Misc ======
Tested with
- Firefox 8 @ Linux
- Chrome 15 @ Windows XP
- MSIE 8 @ Windows XP
running "default", "vector" and "monobook" template.
The diff itself works fine (e.g. if you use the eyeglasses symbol).