[BUG] commit message with tabulation characters

[Aaron Bentley]

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Harald Meland wrote:
> This is due to a typo in my control-character-escaping patch; I have
> updated http://folk.uio.no/hmeland/software/branches/bzr/smallstuff/
> with a fix (against the current bzr.newformat).

One issue here is there are two codepaths, which had different
behaviour, but shouldn't.  Since commit messages must be unicode anyway,
I think it makes sense to convert the message to unicode.  Some test
cases would also be nice.

Aaron
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