merge: report all files in _checkunknown When doing hg up, if there is a file conflict with untracked files, currently only the first such conflict is reported. With this patch, all of them are listed. With this patch error message is now reported as a: untracked file differs b: untracked file differs abort: untracked files in working directory conflict with files in requested revision instead of abort: untracked file in working directory differs from file in requested revision: 'a' This is a follow up to an old attempt to do this here: http://selenic.com/pipermail/mercurial-devel/2011-August/033625.html

  $ hg init

  $ echo a > a
  $ hg ci -qAm 'add a'

  $ hg init subrepo
  $ echo 'subrepo = http://example.net/libfoo' > .hgsub
  $ hg ci -qAm 'added subrepo'

  $ hg up -qC 0
  $ echo ax > a
  $ hg ci -m 'changed a'
  created new head

  $ hg up -qC 1
  $ cd subrepo
  $ echo b > b
  $ hg add b
  $ cd ..

Should fail, since there are added files to subrepo:

  $ hg merge
  abort: outstanding uncommitted changes in subrepository 'subrepo'
  [255]