I just make 2 modification on the gtk-engines-xfce-2.0.8 to update to the gtk-engines-xfce-2.0.10 version (released during october) seems to work perfectly. Changelog: the engine has been changed so that smooth mode looks really nice now, and there are small theme updates.
Created attachment 6485 [details] The file gtk-engines-xfce-2.0.10.ebuild The ebuild of the new version
Created attachment 10852 [details] The digest file for the ebuild
Created attachment 10853 [details] This is the digest file for the ebuild provided
Created attachment 11287 [details] The new ebuild 2.1.0 of gtk-engine-xfce-2.1.0
Created attachment 11288 [details] The digest file of the gtk-engines-xfce-2.1.0
The version has come, gtk-engine-xfce-2.1.0. I submit the new ebuild and the new digest. it works for me. This version comes with new gtk themes.
we'll get around to this once we put in the new gtk-engines.eclass that doesn't require the ridiculous -r1 -r2 setup :)
A new come out 2.1.1, so 2.1.0 is deprecated now
Created attachment 12979 [details] the new ebuild gtk-engines-xfce-2.1.1
gtk-engines-xfce-2.1.1-r1 is the one that is using the new gtk-engines2. although it is masked now, it should be unmasked shortly.