`hg revert` doesn't revert file moves

[Benjamin Smedberg]

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In the Mozilla repo we had to revert an old commit which renamed some files.
It turns out that neither `hg backout` nor `hg revert` will revert a renamed
file correctly: the file is added/removed, but the rename metadata is not
present.

This is filed as http://www.selenic.com/mercurial/bts/issue93, which is
currently marked as Status Chatting: is it possible to get this bug
confirmed? If somebody has a suggestion for how it might be fixed, I might
be able to take a crack at it: I suspect that we will be moving files around
pretty frequently in the Mozilla repo and might get bitten by this bug
occasionally.

In the meantime, I have written a small extension (attached) which can be
used to fix the dirstate after a call to `hg revert`:

# assumes that 'oldname' is marked for removal
# assumes that 'newname' is marked for addition, and is actually a move
# from oldname
hg movefixup oldname newname

Disclaimer: this extension works for me, but it has only very limited error
checking, and I wrote it by copying bits and pieces of mercurial code which
implements `hg mv`. Use at your own risk.

- --BDS
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