tests/test-mq-qsave.t

histedit: fix silly bug that was unpacking a bytestr before writing it

I have this foggy notion that popbuffer() might have returned a list
in the past, but it doesn't anymore, and this was breaking on Python
3. As a bonus, it's probably a ton faster on Python 2 now.

Differential Revision: https://phab.mercurial-scm.org/D2243

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH

  $ hg init

  $ echo 'base' > base
  $ hg ci -Ambase
  adding base

  $ hg qnew -mmqbase mqbase

  $ hg qsave
  $ hg qrestore 2
  restoring status: hg patches saved state