gnus-agent-rename-group

gnus-agent-rename-group is an autoloaded Lisp function in `gnus-agent.el'.

(gnus-agent-rename-group OLD-GROUP NEW-GROUP)

Rename fully-qualified OLD-GROUP as NEW-GROUP.
Always updates the agent, even when disabled, as the old agent
files would corrupt gnus when the agent was next enabled.
Depends upon the caller to determine whether group renaming is
supported.