D3024: scmutil: add method for looking up a context given a revision symbol

[yuja (Yuya Nishihara)]

yuja accepted this revision as: yuja.
yuja added a comment.


  I'm not pretty sure about the details (such as `repo[revset]` vs `repo[rev_or_node]`),
   but the direction sounds generally good to me.
  
  Queued, thanks!

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3024

To: martinvonz, #hg-reviewers, yuja
Cc: mercurial-devel