tests/test-issue1438.t

rebase: provide detailed hint to abort message if working dir is not clean

Detailed hint message is now provided when 'pull --rebase' operation detects
unclean working dir, for example:
  abort: uncommitted changes
  (cannot pull with rebase: please commit or shelve your changes first)

Added tests for uncommitted merge, and for subrepo support verifying that same
hint is also passed to subrepo state check.

#require symlink

https://bz.mercurial-scm.org/1438

  $ hg init

  $ ln -s foo link
  $ hg add link
  $ hg ci -mbad link
  $ hg rm link
  $ hg ci -mok
  $ hg diff -g -r 0:1 > bad.patch

  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg import --no-commit bad.patch
  applying bad.patch

  $ hg status
  R link
  ? bad.patch