D1934: convert: use a collections.deque

[martinvonz (Martin von Zweigbergk)]

martinvonz added inline comments.

INLINE COMMENTS

> convcmd.py:242
>          while visit:
>              n = visit.pop(0)
>              if n in known:

Can this `visit` also get large?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1934

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