Last modified: 2014-11-07 16:03:39 UTC
See https://www.mediawiki.org/wiki/Talk:Multimedia/About_Media_Viewer/Archive04#Small_display_problem for details and a screenshot. Similar to bug 67887 but apparently not fixed by the patch there.
Probably the same issue as bug 72516. The tooltip looks different there, but I would chalk that up to RTL differences. *** This bug has been marked as a duplicate of bug 72516 ***