Hi Frank,
I am not sure if I understand your question.
The Thunar plugin is called thunar-vcs-plugin.
It can handle both svn as well as git.
http://goodies.xfce.org/projects/thunar-plugins/thunar-vcs-plugin
But there's a nasty bug within Fedora that lets Thunar crash randomly,
if this plugin is installed. It's very hard to debug and even reproduce
that issue.
In the hope to answer your question.
Regards,
Raphael