repoview: add visibilityexception argument to filterrevs() and related fns
After this patch, filterrevs() can take an optional argument
visibilityexceptions which is a set of revs which should be exception to
being hidden. The visibilityexceptions will be passed to the function computing
hidden revisions for that filtername and are considered there while calculating
the set of hidden revs.
Differential Revision: https://phab.mercurial-scm.org/D1747
repoview: add visibilityexceptions as an optional argument to repo.filtered()
This will help us in having an API where we can pass the filtername and the
visibilityexceptions to get a new repo object.
Visibility exceptions are the revs which must be visible even they should in
theory belong to the hidden set. They are required as there has been desire to
have a functionality to access hidden changesets using certain commands without
passing --hidden. After this patch we can make those changesets visibility
exceptions so that we can access them without requiring a unfiltered repo.
Differential Revision: https://phab.mercurial-scm.org/D1746