I can reproduce this with gnome-themes-extras versions 0.8.0-3 (sarge) and 0.8.1-1 (sid). It effects all the themes in gnome-themes-extras but is less noticeable with some of them (like Gorilla). I have also confirmed that if affects the Industrial theme (version 0.2.36.6)
I have attached a screenshot of the truncated icons that are shown whilst using the Nuvola theme.
<<attachment: nuvola.png>>
