1. http://dev.translatewiki.net/wiki/Special:Translate?debug=true&filter=&action=page&group=page-0-all&tux=1
2. Click the gray box "State: <something>"
3. Click outside the gray or white (dropdown) box

The dropdown is not hidden but stays; you have to click the gray box again to hide it and go on.
(I don't know if this code is committed already or not, sorry.)

Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=45699