tests/test-mq-qsave.t

subrepo: invoke "_sanitize()" also after "git merge --ff"

Before this patch, sanitizing ".hg/hgrc" in git subrepo doesn't work,
when the working directory is updated by "git merge --ff".

"_sanitize()" is not invoked after checking target revision out into
the working directory in this case, even though it is invoked
indirectly via "checkout" (or "rawcheckout") in other cases.

This patch invokes "_sanitize()" explicitly also after "git merge
--ff" execution.

  $ 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