[Updated] D8562: shelve: get mergestate via context

[indygreg (Gregory Szorc)]

This revision now requires changes to proceed.
indygreg requested changes to this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8562/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8562

To: durin42, #hg-reviewers, marmoute, indygreg
Cc: mercurial-patches
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