How do you revert to an earlier version of a wiki page in Trac?
I know it sounds complicated, but here's one way:
Admittedly, this could be made quite a bit simpler. Feel free to file a ticket on the Trac site to request this enhancement (a quick search didn't yield anything).
Of course, if the version you want to revert to is the previous one, you could also just delete the current version. You will need WIKI_DELETE
permission for that.