[PATCH WIP] help: show help content for disabled extension

[Yuya Nishihara]

On Fri, 21 Oct 2016 09:13:11 -0400, timeless wrote:
> Have we considered supporting `hg help churn.churn` where the first
> churn is a (possibly) disabled extension name, and the second is the
> name of a command within that extension?

Not yet?

> I'm not saying we should do this right away, but I can see some
> advantages to being able to support it later...

Perhaps that would be somewhat useful, but would be much complicated compared
to just parsing a module doc. That's why I think we should simply fix the
issue5228 first.

https://bz.mercurial-scm.org/show_bug.cgi?id=5228