tests/test-execute-bit.t

fix: again allow formatting the working copy while merging

I forgot about unfinished merges (I think I was thinking only about
unfinished merge conflicts) when I wrote
https://phab.mercurial-scm.org/D11209. As a coworker (hg contributor
dploch) reported to me, this led to `hg fix --working-dir` failing
when you have an uncommitted merge. The fix is trivial: just move the
assertion to just before the call to `scmutil.movedirstate()` where it
actually matters.

Differential Revision: https://phab.mercurial-scm.org/D11376

#require execbit

  $ hg init
  $ echo a > a
  $ hg ci -Am'not executable'
  adding a

  $ chmod +x a
  $ hg ci -m'executable'
  $ hg id
  79abf14474dc tip

Make sure we notice the change of mode if the cached size == -1:

  $ hg rm a
  $ hg revert -r 0 a
  $ hg debugstate
  n   0         -1 unset               a
  $ hg status
  M a

  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg id
  d69afc33ff8a
  $ test -x a && echo executable -- bad || echo not executable -- good
  not executable -- good