D628: merge: flush any deferred writes before, and after, running any workers

[quark (Jun Wu)]

quark added a comment.


  Just a personal preference: we can add `def flushall(self): pass` to the other ctx and just call `ctx.flushall()` without testing `isinstance`. I guess that's slightly more readable.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D628

To: phillco, #hg-reviewers
Cc: quark, mercurial-devel