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Disagree with this revert. Expanded-by-default is a much better choice, regardless of what the click tracking says. As an "intentional design decision" it is a poor one.
Please talk about this here: http://usability.wikimedia.org/wiki/Opinion_Language_Links - bottom line, we need to have these conversations before the commit for code that affects the user experience like this does. However, our team also needs to get much better at communicating what has been decided and why as well as what has just been happened upon and is welcome to be changed.
tentatively marking as 'fixme' until discussion of the merits of having it expanded or collapsed by default have reached enough of a consensus to do something about it, at which point it should be changed to the appropriate resolution.
This was essentially reverted by r67559.