fix a bug in dirstate.changes when cwd != repo.root
- use lstat instead of stat
- add a testcase (thanks to Johannes Hofmann)
Is there an error message when trying to diff non-existing files?
found: No such file or directory
not: No such file or directory
Is there an error message when trying to add non-existing files?
found: No such file or directory
not: No such file or directory