revsets and --hidden

[Gilles Moris]

I have been surprised several times that the following command:
$ hg log --rev 'hidden()'

Gvies nothing, then realizing that I need to add --hidden for this to work.
For a basic user, this is difficult to discover this flag, because you 
have to dig in "hg help -v" to find it.
 From a user's perspective, this could almost be considered as a bug.
This is even more true if you try to use the precursors() revset which 
often give hidden commits.

So I think some revsets giving hidden changesets should either:

  * implicitly activate --hidden flag
  * warn hidden changset can be seen with --hidden


I don't know which one is the best. After leaning for the first 
proposition, I am more thinking about a warning.
Alternatives? thoughts?

Regards.
Gilles.
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