tests/test-xdg.t

rebase: use unfiltered repo when loading state

Before this patch, `rebase --abort` may fail to do the cleanup:

  $ hg rebase --abort
  rebase aborted (no revision is removed, only broken state is cleared)

The added test case makes sure `--abort` works in this case.

Differential Revision: https://phab.mercurial-scm.org/D643

#if no-windows no-osx

  $ mkdir -p xdgconf/hg
  $ echo '[ui]' > xdgconf/hg/hgrc
  $ echo 'username = foobar' >> xdgconf/hg/hgrc
  $ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
  $ unset HGRCPATH
  $ hg config ui.username 2>/dev/null
  foobar

#endif