[Planned Changes] D8553: histedit: use context to load mergestate instead of loading it directly

[durin42 (Augie Fackler)]

durin42 planned changes to this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8553/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8553

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