bzr mv --auto unversions old directory that still has other files in it

[James Troup]

| james@ornery:/tmp$ rm -fr wtf; mkdir wtf; cd wtf; bzr init
| Created a standalone tree (format: 2a)
| james@ornery:/tmp/wtf$ mkdir dir1; for i in foo bar baz bat; do echo ${i} > dir1/${i}; done; bzr add; bzr ci -m ""
| adding dir1
| adding dir1/bar
| adding dir1/bat
| adding dir1/baz
| adding dir1/foo
| Committing to: /tmp/wtf/
| added dir1
| added dir1/bar
| added dir1/bat
| added dir1/baz
| added dir1/foo
| Committed revision 1.
| james@ornery:/tmp/wtf$ mkdir dir2; mv dir1/b* dir2/; bzr mv --auto
| dir1 => dir2
| james@ornery:/tmp/wtf$ bzr st
| removed:
| dir1/foo
| renamed:
| dir1/ => dir2/
| unknown:
| dir1/
| james@ornery:/tmp/wtf$ ls -l dir2/
| total 12
| -rw-rw-r-- 1 james james 4 Jan 31 19:22 bar
| -rw-rw-r-- 1 james james 4 Jan 31 19:22 bat
| -rw-rw-r-- 1 james james 4 Jan 31 19:22 baz
| james@ornery:/tmp/wtf$ ls -l dir1/
| total 4
| -rw-rw-r-- 1 james james 4 Jan 31 19:22 foo
| james@ornery:/tmp/wtf$

If I move 'foo' instead of 'b*', the same thing happens. AFAICT any
move of a file from one directory to another will cause 'bzr mv
--auto' to incorrectly unversion the old directory and it's contents.