[win32] shelve problem when trying to shelve current directory

[Alexander Belchenko]

C:\Temp> bzr init 1
C:\Temp>cd 1
C:\Temp\1>bzr mkdir foo
added foo
C:\Temp\1>bzr ci -m 1
Committing to: C:/Temp/1/
added foo
Committed revision 1.

C:\Temp\1>bzr mkdir foo/bar
added foo/bar
C:\Temp\1>cd foo/bar
C:\Temp\1\foo\bar>echo > spam
C:\Temp\1\foo\bar>bzr add spam
adding foo/bar/spam

C:\Temp\1\foo\bar>bzr shelve --all
Selected changes:
-D foo/bar/
-D foo/bar/spam
bzr: ERROR: [Error 32] The process cannot access the file because it is being used by another process

After this error shelve storage has empty (or malformed) item:

C:\Temp\1\foo\bar>bzr shelve --list
  1: <no message>

C:\Temp\1\foo\bar>bzr unshelve --preview
Using changes with id "1".

C:\Temp\1\foo\bar>bzr unshelve --dry-run
Using changes with id "1".