indygreg added inline comments.

INLINE COMMENTS

> context.py:503
> +            repo = self._repo.unfiltered()
> +        return repo.changelog.changelogrevision(self.rev())
>  

Before I accept more of this series, I'd like others to think about the 
potential alternative solution of passing in or storing a reference to the 
changelog on `basectx`/`changectx`. The reason is that a lot of methods are 
calling `repo.changelog` and this can be expensive. I suspect we'd get a 
handful of random performance wins if we cached the changelog instance on each 
`basectx`. We also wouldn't need to litter the code with a bunch of conditional 
`repo.unfiltered()` calls since we'd already have an appropriate changelog 
instance stored in the instance.

Thoughts?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7483/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7483

To: marmoute, #hg-reviewers
Cc: indygreg, mercurial-devel
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