The issue is a GTK one: http://bugzilla.gnome.org/show_bug.cgi?id=316087
** Changed in: gtk+2.0 (Ubuntu)
Priority: Unknown => None
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Confirmed
** Bug 47498 has been marked a duplicate of this bug
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Column resizing acts strangely
https://launchpad.net/bugs/25940