Comment 22 for bug 304345

@Sebastien

Yes, gtk3 is new, but it is hard to say if the problem is with gtk+ or the way the applications themselves are implementing GtkFileChooserDialog. On the latest Ubuntu 12.10, there is a mix of gtk3 (GEdit, Evince, Nautilus) and gtk2 (Firefox, LibreOffice, GIMP, Inkscape, Gnumeric) applications, and the behavior is mostly the same. With the exception of Firefox, both the gtk2 and gtk3 applications seem to display mounted network shares in the Volumes list. None of the gtk2 or gtk3 applications, with the exception of Nautilus, display bookmarks of the network share variety (smb://, sftp://, etc).