Comment 12 for bug 329659

This feature is present in the sources but has been commented out
due to a bug in Qt introduced with the new QTreeView.
The fact is that the folders auto open but _also_ auto close:
and this is extremely confusing.

In August 2008 I have submitted a bug report about this but
it's still there marked as "pending"...

http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=221916

Maybe if you push it a little bit... :D