[PATCH] make bzr mv use rename if only moving one file

[Aaron Bentley]

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David Clymer wrote:
> builtin cmd_mv uses branch.move for multiple and single files.
> Branch.move doesnt seem to handle single files (is there a good reason
> for that?).

I think the point is to provide a cleaner API.  mv(1) can have somewhat
surprising behaviour, because it tries to guess user intention based on
whether the target is a dirctory.

> This patch uses branch.rename_one to mv single files with cmd_mv.

Great.  Do you mind adding a test case?

Aaron
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