Comment 3 for bug 64631

It seems its an optional behavior which can be controlled within the theme.

The bugzilla page about this bug is actually very interesting: all users say its a bug, all develops say its a feature.

Perhaps this can be fixed this in the human-theme?
There is a comment (no. 11) on the bugzilla page about this:

style "default-style"
{
  GtkComboBox::appears-as-list = 1
}

If it is this easy to fix I would recommend to do so. There are just too many cases where it looks and feels unpolished/buggy and one of them is in Gaim.