For quite a moment now, I’ve been using the Aurora GTK engine and theme. Nevertheless, there was a thing that slightly disturbed me: the double scrollbar-button-with-up-arrow. So, firstly, I’ve installed Ubuntu-Tweaker, thinking that would do the configuration trick easily. But then, I found nothing in it about this. So I’ve tried gconf-editor. Nothing there either. Well, beyond this point, I started to imagine that the double-button thing had nothing to do with the configuration of Gnome. I’ve looked at the Aurora files, and searched the Interwebs for some theme-creation documentation. I found this. Especially, the has-secondary-backward-stepper interested me. Looking in Aurora’s gtkrc file, I found a line like:

GtkScrollbar::has-secondary-backward-stepper = 1

Switching the 1 to a 0, and reloading the theme has threw the extra-button away.